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Science Quiz - Class 10 Science Chemical Substances

Question 1/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किसी विलयन का पीएच मान चार है। उसी विलयन में जल मिलाने पर पीएच मान किस दिशा में बदलने की संभावना है?

A solution has pH 4. When water is added to the same solution, in which direction is its pH likely to change?

Explanation opens after your attempt

Correct Answer

A. सात के पासTowards 7

Step 1

Concept

A solution with pH 4 is acidic.

Step 2

Why this answer is correct

Adding water dilutes the acid and decreases its acidity.

Step 3

Exam Tip

On dilution, the pH of an acidic solution moves towards 7 but usually does not become greater than 7.

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Question 2/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किसी क्षारीय विलयन का पीएच मान बारह है। उसमें जल मिलाने पर पीएच मान में क्या परिवर्तन होगा?

A basic solution has pH 12. What happens to its pH when water is added?

Explanation opens after your attempt

Correct Answer

B. पीएच सात के पास घटेगाpH will decrease towards 7

Step 1

Concept

A solution with pH 12 is basic.

Step 2

Why this answer is correct

Adding water dilutes the base and decreases its basicity.

Step 3

Exam Tip

On dilution, the pH of a basic solution moves towards 7.

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Question 3/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

चार विलयनों के पीएच मान पाँच, सात, नौ और ग्यारह हैं। इनमें दाँतों के लिए सबसे कम हानिकारक अम्लीय विलयन कौन सा है?

Four solutions have pH values 5, 7, 9 and 11. Which acidic solution among them is least harmful to teeth?

Explanation opens after your attempt

Correct Answer

A. पीएच पाँच वाला विलयनSolution with pH 5

Step 1

Concept

Among the given values, only pH 5 is acidic.

Step 2

Why this answer is correct

Tooth enamel can be affected when pH falls below about 5.5.

Step 3

Exam Tip

Among acidic substances, lower pH means greater chance of damage.

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Question 4/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

एक अज्ञात विलयन नीले लिटमस को लाल करता है और फिनॉल्फ्थेलीन में रंगहीन रहता है। कौन सा निष्कर्ष सही है?

An unknown solution turns blue litmus red and remains colourless with phenolphthalein. Which conclusion is correct?

Explanation opens after your attempt

Correct Answer

B. विलयन अम्लीय हैThe solution is acidic

Step 1

Concept

Blue litmus turning red shows acidic nature.

Step 2

Why this answer is correct

Phenolphthalein remains colourless in acidic solution.

Step 3

Exam Tip

Both observations together confirm that the solution is acidic.

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Question 5/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

एक विलयन लाल लिटमस को नीला करता है और फिनॉल्फ्थेलीन में गुलाबी रंग देता है। विलयन की प्रकृति क्या होगी?

A solution turns red litmus blue and gives pink colour with phenolphthalein. What is the nature of the solution?

Explanation opens after your attempt

Correct Answer

C. क्षारीयBasic

Step 1

Concept

Red litmus turning blue indicates basic nature.

Step 2

Why this answer is correct

Phenolphthalein becomes pink in a basic solution.

Step 3

Exam Tip

In such questions, combine both indicator observations before choosing the answer.

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Question 6/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस अभिक्रिया में चूने के पानी को दूधिया करने वाली गैस बनने की सबसे अधिक संभावना है?

In which reaction is a gas most likely to form that turns lime water milky?

Explanation opens after your attempt

Correct Answer

B. सोडियम कार्बोनेट और तनु अम्लSodium carbonate and dilute acid

Step 1

Concept

The gas that turns lime water milky is carbon dioxide.

Step 2

Why this answer is correct

Metal carbonates react with acids to produce carbon dioxide.

Step 3

Exam Tip

Therefore, sodium carbonate and dilute acid is the correct pair.

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Question 7/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

धातु और अम्ल की अभिक्रिया में निकली गैस को जलती तिल्ली के पास ले जाने पर चटाक ध्वनि आती है। गैस कौन सी है?

A gas released in the reaction of a metal with an acid gives a pop sound near a burning splint. Which gas is it?

Explanation opens after your attempt

Correct Answer

C. हाइड्रोजनHydrogen

Step 1

Concept

Metals generally react with acids to release hydrogen gas.

Step 2

Why this answer is correct

Hydrogen gives a pop sound near a burning splint.

Step 3

Exam Tip

This is an important gas identification test.

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Question 8/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

ताँबा सामान्यतः तनु हाइड्रोक्लोरिक अम्ल से हाइड्रोजन गैस क्यों नहीं निकालता?

Why does copper generally not produce hydrogen gas with dilute hydrochloric acid?

Explanation opens after your attempt

Correct Answer

A. क्योंकि ताँबा हाइड्रोजन से कम क्रियाशील हैBecause copper is less reactive than hydrogen

Step 1

Concept

A metal displaces hydrogen from an acid only if it is more reactive than hydrogen.

Step 2

Why this answer is correct

Copper is less reactive than hydrogen.

Step 3

Exam Tip

Therefore, copper generally does not release hydrogen from dilute hydrochloric acid.

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Question 9/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

सोडियम हाइड्रॉक्साइड और सल्फ्यूरिक अम्ल की पूर्ण उदासीनीकरण अभिक्रिया से कौन सा लवण बनेगा?

Which salt is formed by complete neutralisation of sodium hydroxide and sulphuric acid?

Explanation opens after your attempt

Correct Answer

B. सोडियम सल्फेटSodium sulphate

Step 1

Concept

Sulphuric acid forms sulphate salts.

Step 2

Why this answer is correct

Sodium hydroxide provides sodium ions.

Step 3

Exam Tip

Therefore, the salt formed is sodium sulphate.

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Question 10/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कैल्शियम हाइड्रॉक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया से कौन सा लवण बनेगा?

Which salt is formed when calcium hydroxide reacts with hydrochloric acid?

Explanation opens after your attempt

Correct Answer

A. कैल्शियम क्लोराइडCalcium chloride

Step 1

Concept

Calcium hydroxide is a base and hydrochloric acid is an acid.

Step 2

Why this answer is correct

Calcium ions and chloride ions combine to form calcium chloride.

Step 3

Exam Tip

Neutralisation forms salt and water.

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Question 11/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस पदार्थ को जल में घोलने पर हाइड्रॉक्साइड आयनों की मात्रा बढ़ती है?

Which substance increases the amount of hydroxide ions when dissolved in water?

Explanation opens after your attempt

Correct Answer

C. सोडियम हाइड्रॉक्साइडSodium hydroxide

Step 1

Concept

Bases produce hydroxide ions in water.

Step 2

Why this answer is correct

Sodium hydroxide is a strong base.

Step 3

Exam Tip

Remember hydrogen ions for acids and hydroxide ions for bases.

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Question 12/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कौन सा कथन तनु अम्ल और सांद्र अम्ल के बारे में सही है?

Which statement about dilute acid and concentrated acid is correct?

Explanation opens after your attempt

Correct Answer

A. तनु अम्ल में प्रति मात्रा विलयन में अम्ल कम होता हैDilute acid has less acid per amount of solution

Step 1

Concept

Dilute and concentrated describe the amount of solute in a solution.

Step 2

Why this answer is correct

A dilute acid has less acid per amount of solution.

Step 3

Exam Tip

Strength and concentration are different ideas.

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Question 13/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

प्रबल अम्ल और कमजोर अम्ल का अंतर मुख्यतः किस पर आधारित है?

The difference between a strong acid and a weak acid is mainly based on what?

Explanation opens after your attempt

Correct Answer

B. जल में आयनीकरण की मात्रा परDegree of ionisation in water

Step 1

Concept

Strong acids ionise almost completely in water.

Step 2

Why this answer is correct

Weak acids ionise only partially in water.

Step 3

Exam Tip

So the difference is based on degree of ionisation.

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Question 14/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

सिरका और हाइड्रोक्लोरिक अम्ल की समान सांद्रता वाले विलयनों में कौन अधिक आयन दे सकता है?

Between equal concentration solutions of vinegar acid and hydrochloric acid, which can produce more ions?

Explanation opens after your attempt

Correct Answer

B. हाइड्रोक्लोरिक अम्लHydrochloric acid

Step 1

Concept

Hydrochloric acid is a strong acid.

Step 2

Why this answer is correct

Acetic acid in vinegar is a weak acid and ionises less.

Step 3

Exam Tip

At the same concentration, a strong acid can produce more ions.

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Question 15/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

अम्लीय वर्षा जल के स्रोतों में सल्फर डाइऑक्साइड और नाइट्रोजन ऑक्साइड का क्या योगदान होता है?

What role do sulphur dioxide and nitrogen oxides play in acid rain?

Explanation opens after your attempt

Correct Answer

A. वे जल में मिलकर अम्ल बना सकते हैंThey can combine with water to form acids

Step 1

Concept

Sulphur dioxide and nitrogen oxides can react with water in the atmosphere.

Step 2

Why this answer is correct

They form acids that lower the pH of rainwater.

Step 3

Exam Tip

Low-pH rain can harm the environment.

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Question 16/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस स्थिति में नदी या झील के जीवों को अम्लीय वर्षा से अधिक खतरा होगा?

In which condition will aquatic organisms in a river or lake be at greater risk from acid rain?

Explanation opens after your attempt

Correct Answer

A. जब जल का पीएच बहुत कम हो जाएWhen the pH of water becomes very low

Step 1

Concept

Aquatic organisms survive well only within a suitable pH range.

Step 2

Why this answer is correct

Acid rain can lower the pH of water bodies.

Step 3

Exam Tip

Very low pH can be harmful to aquatic life.

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Question 17/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

क्लोर क्षार प्रक्रिया में नमकीन जल के विद्युत अपघटन पर धनाग्र और ऋणाग्र पर बनने वाली गैसों का सही क्रम कौन सा है?

In the electrolysis of brine in the chlor-alkali process, what is the correct order of gases formed at anode and cathode?

Explanation opens after your attempt

Correct Answer

B. धनाग्र पर क्लोरीन, ऋणाग्र पर हाइड्रोजनChlorine at anode, hydrogen at cathode

Step 1

Concept

The chlor-alkali process is electrolysis of brine.

Step 2

Why this answer is correct

Chlorine is formed at the anode and hydrogen at the cathode.

Step 3

Exam Tip

Sodium hydroxide remains in the solution.

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Question 18/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

क्लोर क्षार प्रक्रिया को यह नाम क्यों दिया गया है?

Why is the chlor-alkali process given this name?

Explanation opens after your attempt

Correct Answer

A. क्योंकि इससे क्लोरीन और क्षार बनते हैंBecause chlorine and an alkali are produced

Step 1

Concept

Chlorine gas is produced in this process.

Step 2

Why this answer is correct

An alkali, sodium hydroxide, is also produced.

Step 3

Exam Tip

Therefore, the name contains both chlor and alkali.

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Question 19/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

विरंजक चूर्ण को खुले वातावरण में लंबे समय तक रखने से उसकी गुणवत्ता क्यों घट सकती है?

Why can the quality of bleaching powder decrease if it is kept exposed to air for a long time?

Explanation opens after your attempt

Correct Answer

A. क्योंकि वह धीरे-धीरे उपयोगी क्लोरीन खो सकता हैBecause it can gradually lose available chlorine

Step 1

Concept

Bleaching powder is useful due to its available chlorine property.

Step 2

Why this answer is correct

On exposure to air, this property can decrease.

Step 3

Exam Tip

Hence it should be stored in a closed and dry container.

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Question 20/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

बेकिंग पाउडर में उपस्थित खाद्य अम्ल का मुख्य कार्य क्या है?

What is the main role of the edible acid present in baking powder?

Explanation opens after your attempt

Correct Answer

A. बेकिंग सोडा से बने क्षारीय प्रभाव को कम करनाTo reduce the basic effect produced by baking soda

Step 1

Concept

Baking soda can form a basic substance on heating.

Step 2

Why this answer is correct

The edible acid reduces this basic effect and balances taste.

Step 3

Exam Tip

This is why baking powder is different from and more useful than baking soda for baking.

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Question 21/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

सोडियम हाइड्रोजन कार्बोनेट को अम्लरोधी के रूप में क्यों उपयोग किया जा सकता है?

Why can sodium hydrogen carbonate be used as an antacid?

Explanation opens after your attempt

Correct Answer

A. क्योंकि यह हल्का क्षारीय होकर अतिरिक्त अम्ल को निष्क्रिय करता हैBecause it is mildly basic and neutralises excess acid

Step 1

Concept

Sodium hydrogen carbonate is mildly basic.

Step 2

Why this answer is correct

It can neutralise excess acid in the stomach.

Step 3

Exam Tip

Antacids work on the principle of neutralisation.

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Question 22/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

वाशिंग सोडा और बेकिंग सोडा में सही मिलान कौन सा है?

Which is the correct matching for washing soda and baking soda?

Explanation opens after your attempt

Correct Answer

B. वाशिंग सोडा सोडियम कार्बोनेट दशजल है, बेकिंग सोडा सोडियम हाइड्रोजन कार्बोनेट हैWashing soda is sodium carbonate decahydrate, baking soda is sodium hydrogen carbonate

Step 1

Concept

Washing soda is sodium carbonate decahydrate.

Step 2

Why this answer is correct

Baking soda is sodium hydrogen carbonate.

Step 3

Exam Tip

Remember both names along with their uses.

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Question 23/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कपड़े धोने में कठोर जल के साथ साबुन कम झाग क्यों देता है?

Why does soap produce less lather with hard water while washing clothes?

Explanation opens after your attempt

Correct Answer

A. कठोर जल में कैल्शियम और मैग्नीशियम लवण होते हैंHard water contains calcium and magnesium salts

Step 1

Concept

Hard water contains calcium and magnesium salts.

Step 2

Why this answer is correct

These can react with soap and reduce lather formation.

Step 3

Exam Tip

Washing soda helps remove such ions.

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Question 24/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

सफेद निर्जल कॉपर सल्फेट में जल डालते ही नीला रंग लौट आता है। यह किसकी उपस्थिति दर्शाता है?

White anhydrous copper sulphate turns blue when water is added. What does this show?

Explanation opens after your attempt

Correct Answer

A. जल की उपस्थितिPresence of water

Step 1

Concept

Anhydrous copper sulphate is white.

Step 2

Why this answer is correct

On adding water, it becomes hydrated and turns blue.

Step 3

Exam Tip

Therefore, it can be used to test the presence of water.

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Question 25/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

जिप्सम और प्लास्टर ऑफ पेरिस के बीच मुख्य अंतर किससे संबंधित है?

The main difference between gypsum and plaster of Paris is related to what?

Explanation opens after your attempt

Correct Answer

A. क्रिस्टलीय जल की मात्राAmount of water of crystallisation

Step 1

Concept

Gypsum is a more hydrated form of calcium sulphate.

Step 2

Why this answer is correct

Plaster of Paris is prepared by controlled heating of gypsum and contains less water of crystallisation.

Step 3

Exam Tip

Understand both through water of crystallisation.

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Question 26/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

प्लास्टर ऑफ पेरिस में जल मिलाने पर वह कठोर क्यों हो जाता है?

Why does plaster of Paris become hard when water is added?

Explanation opens after your attempt

Correct Answer

A. क्योंकि वह जिप्सम में बदलता हैBecause it changes into gypsum

Step 1

Concept

Plaster of Paris reacts with water.

Step 2

Why this answer is correct

It forms a hard gypsum-like substance.

Step 3

Exam Tip

This setting property makes it useful for casts, statues and moulds.

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Question 27/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस लवण का जलीय विलयन क्षारीय प्रकृति दिखाने की सबसे अधिक संभावना रखता है?

Which salt is most likely to show basic nature in aqueous solution?

Explanation opens after your attempt

Correct Answer

A. सोडियम कार्बोनेटSodium carbonate

Step 1

Concept

Sodium carbonate is a salt of a weak acid and a strong base.

Step 2

Why this answer is correct

Such a salt can give a basic aqueous solution.

Step 3

Exam Tip

Relate the nature of salts to their parent acid and base.

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Question 28/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस लवण का जलीय विलयन अम्लीय प्रकृति दिखाने की संभावना रखता है?

Which salt is likely to show acidic nature in aqueous solution?

Explanation opens after your attempt

Correct Answer

B. अमोनियम क्लोराइडAmmonium chloride

Step 1

Concept

Ammonium chloride is considered a salt of a strong acid and a weak base.

Step 2

Why this answer is correct

Such a salt can give an acidic aqueous solution.

Step 3

Exam Tip

Understand salt pH from its parent acid and base, not only from its name.

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Question 29/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कौन सा लवण प्रबल अम्ल और प्रबल क्षार से बनने के कारण लगभग उदासीन विलयन देता है?

Which salt gives a nearly neutral solution because it is formed from a strong acid and a strong base?

Explanation opens after your attempt

Correct Answer

C. सोडियम क्लोराइडSodium chloride

Step 1

Concept

Sodium chloride is formed from hydrochloric acid and sodium hydroxide.

Step 2

Why this answer is correct

Both are considered strong.

Step 3

Exam Tip

Therefore, its solution is nearly neutral.

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Question 30/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कार्बन डाइऑक्साइड को अधातु ऑक्साइड और अम्लीय ऑक्साइड दोनों क्यों माना जाता है?

Why is carbon dioxide considered both a non-metal oxide and an acidic oxide?

Explanation opens after your attempt

Correct Answer

A. क्योंकि यह कार्बन का ऑक्साइड है और जल में अम्लीय विलयन बना सकता हैBecause it is an oxide of carbon and can form an acidic solution in water

Step 1

Concept

Carbon is a non-metal, so its oxide is a non-metal oxide.

Step 2

Why this answer is correct

Carbon dioxide can form carbonic acid in water.

Step 3

Exam Tip

Therefore, it is an example of an acidic oxide.

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Question 31/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कैल्शियम ऑक्साइड को क्षारीय ऑक्साइड क्यों कहा जाता है?

Why is calcium oxide called a basic oxide?

Explanation opens after your attempt

Correct Answer

A. क्योंकि यह अम्लों से अभिक्रिया करके लवण और जल बना सकता हैBecause it can react with acids to form salt and water

Step 1

Concept

Calcium oxide is a metal oxide.

Step 2

Why this answer is correct

Metal oxides generally react with acids to form salt and water.

Step 3

Exam Tip

This is a key property of basic oxides.

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Question 32/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

शुष्क हाइड्रोजन क्लोराइड गैस नीले लिटमस को लाल नहीं करती, पर जल में घुलने पर करती है। इससे क्या सिद्ध होता है?

Dry hydrogen chloride gas does not turn blue litmus red, but it does so after dissolving in water. What does this prove?

Explanation opens after your attempt

Correct Answer

A. अम्लीय गुण दिखाने के लिए जल में आयन बनना आवश्यक हैFormation of ions in water is necessary to show acidic character

Step 1

Concept

Acids form hydrogen ions in water.

Step 2

Why this answer is correct

In dry conditions, these ions are not available.

Step 3

Exam Tip

After dissolving in water, ions form and acidic character appears.

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Question 33/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

यदि अम्लीय विलयन में हाइड्रोजन आयनों की मात्रा दस गुना बढ़ जाए, तो पीएच पर सामान्य प्रभाव क्या होगा?

If the concentration of hydrogen ions in an acidic solution increases ten times, what is the general effect on pH?

Explanation opens after your attempt

Correct Answer

A. पीएच लगभग एक इकाई घटता हैpH decreases by about one unit

Step 1

Concept

pH is inversely related to hydrogen ion concentration.

Step 2

Why this answer is correct

More hydrogen ions mean greater acidity and lower pH.

Step 3

Exam Tip

A tenfold increase generally lowers pH by about one unit.

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Question 34/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

पीएच तीन और पीएच पाँच वाले दो अम्लीय विलयनों में कौन सा अधिक अम्लीय है?

Between two acidic solutions of pH 3 and pH 5, which one is more acidic?

Explanation opens after your attempt

Correct Answer

C. पीएच तीन वालाThe one with pH 3

Step 1

Concept

In acidic solutions, lower pH indicates higher acidity.

Step 2

Why this answer is correct

pH 3 is lower than pH 5.

Step 3

Exam Tip

Therefore, the solution with pH 3 is more acidic.

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Question 35/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

पीएच दस और पीएच तेरह वाले दो क्षारीय विलयनों में कौन सा अधिक क्षारीय है?

Between two basic solutions of pH 10 and pH 13, which one is more basic?

Explanation opens after your attempt

Correct Answer

B. पीएच तेरह वालाThe one with pH 13

Step 1

Concept

In basic solutions, higher pH indicates greater basicity.

Step 2

Why this answer is correct

pH 13 is higher than pH 10.

Step 3

Exam Tip

Therefore, the solution with pH 13 is more basic.

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Question 36/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

अम्लीय मिट्टी में चूना मिलाने की क्रिया किस सिद्धांत पर आधारित है?

Adding lime to acidic soil is based on which principle?

Explanation opens after your attempt

Correct Answer

A. उदासीनीकरणNeutralisation

Step 1

Concept

Acidic soil has excess acidity.

Step 2

Why this answer is correct

Lime is basic and reduces this acidity.

Step 3

Exam Tip

Such acid-base action is called neutralisation.

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Question 37/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

क्षारीय मिट्टी में जैविक पदार्थ मिलाने से धीरे-धीरे सुधार क्यों हो सकता है?

Why can adding organic matter gradually improve basic soil?

Explanation opens after your attempt

Correct Answer

A. जैविक पदार्थ विघटित होकर अम्लीय पदार्थ बना सकता हैOrganic matter can decompose to form acidic substances

Step 1

Concept

Highly basic soil may not be suitable for plants.

Step 2

Why this answer is correct

Organic matter can decompose and form mildly acidic substances.

Step 3

Exam Tip

This can reduce the basicity of soil.

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Question 38/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस पदार्थ का स्वाद खट्टा और स्वभाव अम्लीय होने की संभावना है?

Which substance is likely to taste sour and be acidic in nature?

Explanation opens after your attempt

Correct Answer

B. नींबू का रसLemon juice

Step 1

Concept

Many acidic substances taste sour.

Step 2

Why this answer is correct

Lemon juice contains a natural acid.

Step 3

Exam Tip

In the laboratory, do not test by taste; use indicators.

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Question 39/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस पदार्थ का स्पर्श साबुन जैसा और स्वभाव क्षारीय होने की संभावना है?

Which substance is likely to feel soapy and be basic in nature?

Explanation opens after your attempt

Correct Answer

C. सोडियम हाइड्रॉक्साइड विलयनSodium hydroxide solution

Step 1

Concept

Basic substances may feel soapy.

Step 2

Why this answer is correct

Sodium hydroxide is a basic substance.

Step 3

Exam Tip

In the laboratory, such substances should not be touched directly by hand.

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Question 40/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

घ्राण सूचक के रूप में वेनिला की गंध क्षार में कम हो जाती है। यह अवलोकन किसकी पहचान में उपयोगी है?

The smell of vanilla decreases in a base when used as an olfactory indicator. This observation is useful for identifying what?

Explanation opens after your attempt

Correct Answer

A. क्षारीय विलयनBasic solution

Step 1

Concept

Olfactory indicators give clues by change in smell.

Step 2

Why this answer is correct

The smell of vanilla can decrease in a basic medium.

Step 3

Exam Tip

Therefore, it can help identify a basic solution.

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Question 41/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

कौन सा कथन सूचकों के बारे में सबसे सही है?

Which statement about indicators is the most correct?

Explanation opens after your attempt

Correct Answer

A. सूचक अम्ल और क्षार में रंग या गंध का परिवर्तन दिखा सकते हैंIndicators can show colour or smell change in acids and bases

Step 1

Concept

Indicators help identify the nature of a solution.

Step 2

Why this answer is correct

Some indicators show colour change and some show smell change.

Step 3

Exam Tip

Indicators do not themselves neutralise the solution.

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Question 42/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस स्थिति में उदासीनीकरण अभिक्रिया का परिणाम लगभग उदासीन विलयन हो सकता है?

In which condition can a neutralisation reaction result in a nearly neutral solution?

Explanation opens after your attempt

Correct Answer

A. जब अम्ल और क्षार उचित मात्रा में अभिक्रिया करेंWhen acid and base react in suitable amounts

Step 1

Concept

Neutralisation is a reaction between an acid and a base.

Step 2

Why this answer is correct

When both react in suitable amounts, acidity and basicity can reduce.

Step 3

Exam Tip

Salt and water are formed.

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Question 43/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

यदि हाइड्रोक्लोरिक अम्ल और सोडियम हाइड्रॉक्साइड की उचित मात्रा मिलाई जाए, तो अंतिम विलयन में मुख्यतः क्या होगा?

If suitable amounts of hydrochloric acid and sodium hydroxide are mixed, what will mainly be present in the final solution?

Explanation opens after your attempt

Correct Answer

A. सोडियम क्लोराइड और जलSodium chloride and water

Step 1

Concept

Hydrochloric acid and sodium hydroxide undergo neutralisation.

Step 2

Why this answer is correct

They form sodium chloride and water.

Step 3

Exam Tip

This is a basic example of neutralisation.

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Question 44/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

अम्ल और धातु हाइड्रोजन कार्बोनेट की अभिक्रिया में कौन से उत्पाद बनते हैं?

What products are formed when an acid reacts with a metal hydrogen carbonate?

Explanation opens after your attempt

Correct Answer

A. लवण, जल और कार्बन डाइऑक्साइडSalt, water and carbon dioxide

Step 1

Concept

Metal hydrogen carbonates react with acids.

Step 2

Why this answer is correct

They form salt, water and carbon dioxide.

Step 3

Exam Tip

Carbon dioxide turns lime water milky.

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Question 45/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

सोडियम हाइड्रोजन कार्बोनेट और हाइड्रोक्लोरिक अम्ल की अभिक्रिया में बनने वाला लवण कौन सा है?

Which salt is formed in the reaction between sodium hydrogen carbonate and hydrochloric acid?

Explanation opens after your attempt

Correct Answer

B. सोडियम क्लोराइडSodium chloride

Step 1

Concept

Hydrochloric acid provides chloride ions.

Step 2

Why this answer is correct

Sodium hydrogen carbonate provides sodium ions.

Step 3

Exam Tip

Sodium chloride is formed, along with water and carbon dioxide.

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Question 46/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

यदि किसी विलयन में लाल लिटमस और नीले लिटमस दोनों का रंग नहीं बदलता, तो सबसे संभावित निष्कर्ष क्या होगा?

If a solution does not change the colour of both red and blue litmus papers, what is the most likely conclusion?

Explanation opens after your attempt

Correct Answer

C. विलयन उदासीन हो सकता हैThe solution may be neutral

Step 1

Concept

Acids turn blue litmus red.

Step 2

Why this answer is correct

Bases turn red litmus blue.

Step 3

Exam Tip

If neither litmus changes, the solution may be neutral.

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Question 47/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस कारण से अम्लीय और क्षारीय पदार्थों को सीधे चखकर पहचानना गलत है?

Why is it wrong to identify acidic and basic substances by directly tasting them?

Explanation opens after your attempt

Correct Answer

A. क्योंकि वे हानिकारक या संक्षारक हो सकते हैंBecause they may be harmful or corrosive

Step 1

Concept

Many acids and bases can harm the body.

Step 2

Why this answer is correct

Some may also be corrosive.

Step 3

Exam Tip

Use safe indicator tests instead of tasting substances.

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Question 48/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

सांद्र सल्फ्यूरिक अम्ल का तनुकरण करते समय अम्ल को जल में धीरे-धीरे मिलाने का सही कारण क्या है?

What is the correct reason for adding concentrated sulphuric acid slowly to water during dilution?

Explanation opens after your attempt

Correct Answer

A. तनुकरण में बहुत ऊष्मा निकलती है और छींटे पड़ सकते हैंDilution releases a lot of heat and may cause splashing

Step 1

Concept

Dissolving concentrated acid in water is exothermic.

Step 2

Why this answer is correct

Sudden heat release can cause acid splashing.

Step 3

Exam Tip

Therefore, acid must be added slowly to water.

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Question 49/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

अम्लीय विलयन में जल मिलाने पर प्रति इकाई आयतन हाइड्रोजन आयनों की संख्या पर क्या प्रभाव पड़ता है?

What happens to the number of hydrogen ions per unit volume when water is added to an acidic solution?

Explanation opens after your attempt

Correct Answer

A. वह घटती हैIt decreases

Step 1

Concept

Adding water dilutes the acidic solution.

Step 2

Why this answer is correct

The number of hydrogen ions per unit volume decreases.

Step 3

Exam Tip

Therefore, acidity decreases and pH increases.

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Question 50/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

क्षारीय विलयन में जल मिलाने पर प्रति इकाई आयतन हाइड्रॉक्साइड आयनों की संख्या पर क्या प्रभाव पड़ता है?

What happens to the number of hydroxide ions per unit volume when water is added to a basic solution?

Explanation opens after your attempt

Correct Answer

B. वह घटती हैIt decreases

Step 1

Concept

Adding water dilutes the basic solution.

Step 2

Why this answer is correct

The number of hydroxide ions per unit volume decreases.

Step 3

Exam Tip

Therefore, basicity decreases and pH moves towards 7.

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Class 10 Science - Chemical Substances – Nature and Behaviour - Acids, Bases, and Salts Medium Quiz

किसी विलयन का पीएच मान चार है। उसी विलयन में जल मिलाने पर पीएच मान किस दिशा में बदलने की संभावना है?

Concept

Why this answer is correct

Exam Tip

किसी क्षारीय विलयन का पीएच मान बारह है। उसमें जल मिलाने पर पीएच मान में क्या परिवर्तन होगा?

Concept

Why this answer is correct

Exam Tip

चार विलयनों के पीएच मान पाँच, सात, नौ और ग्यारह हैं। इनमें दाँतों के लिए सबसे कम हानिकारक अम्लीय विलयन कौन सा है?

Concept

Why this answer is correct

Exam Tip

एक अज्ञात विलयन नीले लिटमस को लाल करता है और फिनॉल्फ्थेलीन में रंगहीन रहता है। कौन सा निष्कर्ष सही है?

Concept

Why this answer is correct

Exam Tip

एक विलयन लाल लिटमस को नीला करता है और फिनॉल्फ्थेलीन में गुलाबी रंग देता है। विलयन की प्रकृति क्या होगी?

Concept

Why this answer is correct

Exam Tip

किस अभिक्रिया में चूने के पानी को दूधिया करने वाली गैस बनने की सबसे अधिक संभावना है?

Concept

Why this answer is correct

Exam Tip

धातु और अम्ल की अभिक्रिया में निकली गैस को जलती तिल्ली के पास ले जाने पर चटाक ध्वनि आती है। गैस कौन सी है?

Concept

Why this answer is correct

Exam Tip

ताँबा सामान्यतः तनु हाइड्रोक्लोरिक अम्ल से हाइड्रोजन गैस क्यों नहीं निकालता?

Concept

Why this answer is correct

Exam Tip

सोडियम हाइड्रॉक्साइड और सल्फ्यूरिक अम्ल की पूर्ण उदासीनीकरण अभिक्रिया से कौन सा लवण बनेगा?

Concept

Why this answer is correct

Exam Tip

कैल्शियम हाइड्रॉक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया से कौन सा लवण बनेगा?

Concept

Why this answer is correct

Exam Tip

किस पदार्थ को जल में घोलने पर हाइड्रॉक्साइड आयनों की मात्रा बढ़ती है?

Concept

Why this answer is correct

Exam Tip

कौन सा कथन तनु अम्ल और सांद्र अम्ल के बारे में सही है?

Concept

Why this answer is correct

Exam Tip

प्रबल अम्ल और कमजोर अम्ल का अंतर मुख्यतः किस पर आधारित है?

Concept

Why this answer is correct

Exam Tip

सिरका और हाइड्रोक्लोरिक अम्ल की समान सांद्रता वाले विलयनों में कौन अधिक आयन दे सकता है?

Concept

Why this answer is correct

Exam Tip

अम्लीय वर्षा जल के स्रोतों में सल्फर डाइऑक्साइड और नाइट्रोजन ऑक्साइड का क्या योगदान होता है?

Concept

Why this answer is correct

Exam Tip

किस स्थिति में नदी या झील के जीवों को अम्लीय वर्षा से अधिक खतरा होगा?

Concept

Why this answer is correct

Exam Tip

क्लोर क्षार प्रक्रिया में नमकीन जल के विद्युत अपघटन पर धनाग्र और ऋणाग्र पर बनने वाली गैसों का सही क्रम कौन सा है?

Concept

Why this answer is correct

Exam Tip

क्लोर क्षार प्रक्रिया को यह नाम क्यों दिया गया है?

Concept

Why this answer is correct

Exam Tip

विरंजक चूर्ण को खुले वातावरण में लंबे समय तक रखने से उसकी गुणवत्ता क्यों घट सकती है?

Concept

Why this answer is correct

Exam Tip

बेकिंग पाउडर में उपस्थित खाद्य अम्ल का मुख्य कार्य क्या है?

Concept

Why this answer is correct