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

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

Level 11 • 50/50 questions • 35 seconds per question.

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Question 1/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि दो अम्लीय विलयनों के पीएच मान क्रमशः दो और चार हैं, तो हाइड्रोजन आयनों की मात्रा किसमें अधिक होगी?

If two acidic solutions have pH values 2 and 4 respectively, which one has a higher concentration of hydrogen ions?

Explanation opens after your attempt
Correct Answer

A. पीएच दो वाला विलयनSolution with pH 2

Step 1

Concept

Lower pH means higher acidity.

Step 2

Why this answer is correct

A more acidic solution has more hydrogen ions.

Step 3

Exam Tip

Therefore, the solution with pH 2 has higher hydrogen ion concentration.

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Question 2/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि किसी क्षारीय विलयन का पीएच तेरह है, तो जल मिलाने पर वह किस दिशा में बदलेगा?

If a basic solution has pH 13, in which direction will it change when water is added?

Explanation opens after your attempt
Correct Answer

B. पीएच सात की ओर घटेगाpH will decrease towards 7

Step 1

Concept

A basic solution has pH greater than 7.

Step 2

Why this answer is correct

Adding water dilutes the base.

Step 3

Exam Tip

On dilution, its pH moves towards 7.

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Question 3/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

किसी विलयन में नीला लिटमस लाल हो जाता है, पर लाल लिटमस में कोई परिवर्तन नहीं होता। विलयन का स्वभाव क्या है?

In a solution, blue litmus turns red, but red litmus shows no change. What is the nature of the solution?

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Correct Answer

C. अम्लीयAcidic

Step 1

Concept

Acids turn blue litmus red.

Step 2

Why this answer is correct

Red litmus already has the acidic colour, so it does not change.

Step 3

Exam Tip

This identifies an acidic solution.

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Question 4/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

किसी विलयन में लाल लिटमस नीला हो जाता है, पर नीले लिटमस में कोई परिवर्तन नहीं होता। विलयन किस प्रकार का है?

In a solution, red litmus turns blue, but blue litmus shows no change. What type of solution is it?

Explanation opens after your attempt
Correct Answer

D. क्षारीयBasic

Step 1

Concept

Bases turn red litmus blue.

Step 2

Why this answer is correct

Blue litmus remains blue in a base.

Step 3

Exam Tip

Both observations indicate a basic solution.

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Question 5/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

फिनॉल्फ्थेलीन किसी विलयन में गुलाबी हो जाती है और मिथाइल ऑरेंज पीला हो जाता है। यह विलयन कैसा होगा?

Phenolphthalein turns pink and methyl orange turns yellow in a solution. What is the nature of this solution?

Explanation opens after your attempt
Correct Answer

A. क्षारीयBasic

Step 1

Concept

Phenolphthalein turns pink in a basic solution.

Step 2

Why this answer is correct

Methyl orange turns yellow in a basic solution.

Step 3

Exam Tip

Both observations show basic nature.

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Question 6/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अम्ल और धातु कार्बोनेट की अभिक्रिया में बनने वाली गैस को अधिक मात्रा में चूने के पानी से गुजारने पर विलयन फिर साफ हो सकता है। इसका कारण क्या है?

The gas formed in an acid and metal carbonate reaction can make lime water clear again when passed in excess. What is the reason?

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Correct Answer

A. घुलनशील कैल्शियम हाइड्रोजन कार्बोनेट बनता हैSoluble calcium hydrogen carbonate is formed

Step 1

Concept

Carbon dioxide first forms calcium carbonate and makes lime water milky.

Step 2

Why this answer is correct

Excess carbon dioxide forms soluble calcium hydrogen carbonate.

Step 3

Exam Tip

Therefore, the solution can become clear again.

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Question 7/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अम्ल और धातु की अभिक्रिया में लवण और हाइड्रोजन गैस बनती है। यदि धातु मैग्नीशियम और अम्ल सल्फ्यूरिक अम्ल हो, तो लवण कौन सा होगा?

A metal and an acid react to form a salt and hydrogen gas. If the metal is magnesium and the acid is sulphuric acid, which salt will be formed?

Explanation opens after your attempt
Correct Answer

B. मैग्नीशियम सल्फेटMagnesium sulphate

Step 1

Concept

Sulphuric acid forms sulphate salts.

Step 2

Why this answer is correct

Magnesium provides magnesium ions.

Step 3

Exam Tip

Therefore, magnesium sulphate is formed.

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Question 8/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

कौन सा पदार्थ अम्ल से अभिक्रिया करके हाइड्रोजन के बजाय कार्बन डाइऑक्साइड गैस देगा?

Which substance will react with an acid to give carbon dioxide instead of hydrogen?

Explanation opens after your attempt
Correct Answer

C. सोडियम कार्बोनेटSodium carbonate

Step 1

Concept

Metals can give hydrogen gas with acids.

Step 2

Why this answer is correct

Carbonates give carbon dioxide with acids.

Step 3

Exam Tip

Therefore, sodium carbonate is the correct answer.

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

किस पदार्थ का उपयोग अम्लीय मिट्टी के उपचार में सबसे उपयुक्त होगा?

Which substance is most suitable for treating acidic soil?

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Correct Answer

C. चूनाLime

Step 1

Concept

Acidic soil has excess acidity.

Step 2

Why this answer is correct

Lime is basic and reduces acidity.

Step 3

Exam Tip

This treatment is based on neutralisation.

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

किस पदार्थ को क्षारीय मिट्टी के उपचार में मिलाने से धीरे-धीरे अम्लीय पदार्थ बन सकते हैं?

Which substance can be added to basic soil so that acidic substances may gradually form?

Explanation opens after your attempt
Correct Answer

C. जैविक पदार्थOrganic matter

Step 1

Concept

Basic soil has excess basicity.

Step 2

Why this answer is correct

Organic matter can decompose to form mildly acidic substances.

Step 3

Exam Tip

This can reduce the basicity of soil.

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

दाँतों की परत को नुकसान पहुँचाने वाली स्थिति किससे संबंधित है?

The condition that damages tooth enamel is related to which of the following?

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Correct Answer

A. मुँह में पीएच पाँच दशमलव पाँच से कम होनाpH in the mouth falling below 5.5

Step 1

Concept

Acids can form in the mouth after eating.

Step 2

Why this answer is correct

Tooth enamel is affected when pH falls below 5.5.

Step 3

Exam Tip

Toothpaste helps reduce acidity.

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Question 12/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

पेट में अधिक अम्ल बनने पर लिया जाने वाला अम्लरोधी किस सिद्धांत पर काम करता है?

An antacid taken for excess stomach acid works on which principle?

Explanation opens after your attempt
Correct Answer

C. उदासीनीकरणNeutralisation

Step 1

Concept

Excess acid in the stomach can cause burning.

Step 2

Why this answer is correct

An antacid is mildly basic.

Step 3

Exam Tip

It neutralises the acid, so the principle is neutralisation.

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Question 13/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सोडियम हाइड्रोजन कार्बोनेट का उपयोग अग्निशामक में क्यों किया जा सकता है?

Why can sodium hydrogen carbonate be used in fire extinguishers?

Explanation opens after your attempt
Correct Answer

A. यह गरम होने पर कार्बन डाइऑक्साइड दे सकता हैIt can release carbon dioxide on heating

Step 1

Concept

Sodium hydrogen carbonate can release carbon dioxide on heating.

Step 2

Why this answer is correct

Carbon dioxide reduces the supply of oxygen around fire.

Step 3

Exam Tip

Therefore, it helps in fire extinguishing.

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Question 14/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

बेकिंग पाउडर में बेकिंग सोडा के साथ हल्का खाद्य अम्ल मिलाने का मुख्य लाभ क्या है?

What is the main benefit of adding a mild edible acid with baking soda in baking powder?

Explanation opens after your attempt
Correct Answer

B. यह क्षारीय कड़वाहट को कम करता है और कार्बन डाइऑक्साइड बनाने में मदद करता हैIt reduces basic bitterness and helps produce carbon dioxide

Step 1

Concept

Baking soda alone can give a basic taste.

Step 2

Why this answer is correct

The edible acid balances this effect.

Step 3

Exam Tip

The reaction releases carbon dioxide, which makes food rise.

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Question 15/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

वाशिंग सोडा कठोर जल को नरम करने में कैसे सहायता करता है?

How does washing soda help in softening hard water?

Explanation opens after your attempt
Correct Answer

A. यह कैल्शियम और मैग्नीशियम आयनों को हटाने में सहायता करता हैIt helps remove calcium and magnesium ions

Step 1

Concept

Hard water contains calcium and magnesium salts.

Step 2

Why this answer is correct

Washing soda helps remove these ions.

Step 3

Exam Tip

This softens water and soap forms better lather.

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Question 16/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

विरंजक चूर्ण का जल शोधन में उपयोग किस गुण के कारण होता है?

Due to which property is bleaching powder used in water purification?

Explanation opens after your attempt
Correct Answer

B. कीटाणुनाशक गुण के कारणDue to disinfecting property

Step 1

Concept

Bleaching powder has disinfecting action.

Step 2

Why this answer is correct

It helps reduce harmful microorganisms in water.

Step 3

Exam Tip

Therefore, it is used in water purification.

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Question 17/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सामान्य नमक से सोडियम हाइड्रॉक्साइड प्राप्त करने वाली प्रक्रिया कौन सी है?

Which process is used to obtain sodium hydroxide from common salt?

Explanation opens after your attempt
Correct Answer

B. क्लोर क्षार प्रक्रियाChlor-alkali process

Step 1

Concept

Aqueous solution of common salt is called brine.

Step 2

Why this answer is correct

Electrolysis of brine gives sodium hydroxide.

Step 3

Exam Tip

This process is called the chlor-alkali process.

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Question 18/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

क्लोर क्षार प्रक्रिया में प्राप्त तीन मुख्य उत्पादों का सही समूह कौन सा है?

Which is the correct group of three main products obtained in the chlor-alkali process?

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Correct Answer

A. क्लोरीन, हाइड्रोजन और सोडियम हाइड्रॉक्साइडChlorine, hydrogen and sodium hydroxide

Step 1

Concept

The chlor-alkali process involves electrolysis of brine.

Step 2

Why this answer is correct

It produces chlorine, hydrogen and sodium hydroxide.

Step 3

Exam Tip

All three are industrially useful substances.

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Question 19/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि किसी लवण का विलयन नीले लिटमस पर कोई प्रभाव नहीं डालता और लाल लिटमस पर भी कोई प्रभाव नहीं डालता, तो उसका पीएच लगभग कितना हो सकता है?

If a salt solution has no effect on both blue and red litmus, what may be its approximate pH?

Explanation opens after your attempt
Correct Answer

B. सात7

Step 1

Concept

No effect on both litmus papers may indicate neutrality.

Step 2

Why this answer is correct

A neutral solution has pH around 7.

Step 3

Exam Tip

Pure water and common salt solution can be examples.

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Question 20/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अमोनियम क्लोराइड का जलीय विलयन नीले लिटमस को लाल कर सकता है। इसका कारण क्या है?

An aqueous solution of ammonium chloride can turn blue litmus red. What is the reason?

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Correct Answer

B. यह प्रबल अम्ल और कमजोर क्षार से बने लवण का उदाहरण हैIt is an example of a salt made from a strong acid and a weak base

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 solution.

Step 3

Exam Tip

Therefore, it can turn blue litmus red.

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Question 21/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सोडियम कार्बोनेट का विलयन लाल लिटमस को नीला कर सकता है। यह किस प्रकार का लवण है?

A sodium carbonate solution can turn red litmus blue. What type of salt is it?

Explanation opens after your attempt
Correct Answer

A. कमजोर अम्ल और प्रबल क्षार से बना लवणSalt of a weak acid and a strong base

Step 1

Concept

Sodium carbonate solution shows basic nature.

Step 2

Why this answer is correct

It is an example of a salt of a weak acid and a strong base.

Step 3

Exam Tip

Therefore, it can turn red litmus blue.

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Question 22/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सोडियम क्लोराइड का विलयन सामान्यतः उदासीन क्यों माना जाता है?

Why is sodium chloride solution generally considered neutral?

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Correct Answer

B. क्योंकि यह प्रबल अम्ल और प्रबल क्षार से बना हैBecause it is made from a strong acid and a strong base

Step 1

Concept

Sodium chloride is formed from hydrochloric acid and sodium hydroxide.

Step 2

Why this answer is correct

Both are strong.

Step 3

Exam Tip

Therefore, its solution is nearly neutral.

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Question 23/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

धातु ऑक्साइड का अम्ल से अभिक्रिया करके लवण और जल बनाना किस स्वभाव को दर्शाता है?

A metal oxide reacts with an acid to form salt and water. Which nature does this show?

Explanation opens after your attempt
Correct Answer

B. क्षारीय स्वभावBasic nature

Step 1

Concept

Bases react with acids to form salt and water.

Step 2

Why this answer is correct

Metal oxides show similar behaviour with acids.

Step 3

Exam Tip

Therefore, most metal oxides are called basic oxides.

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Question 24/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अधातु ऑक्साइड जल में अम्लीय विलयन बना सकते हैं। इनमें से कौन सा इसका उदाहरण है?

Non-metal oxides can form acidic solutions in water. Which of the following is an example?

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Correct Answer

C. कार्बन डाइऑक्साइडCarbon dioxide

Step 1

Concept

Carbon is a non-metal.

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 25/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

कौन सा ऑक्साइड अम्ल और क्षार दोनों से अभिक्रिया कर सकता है?

Which oxide can react with both acids and bases?

Explanation opens after your attempt
Correct Answer

C. उभयधर्मी ऑक्साइडAmphoteric oxide

Step 1

Concept

Some oxides can react with both acids and bases.

Step 2

Why this answer is correct

Such oxides are called amphoteric oxides.

Step 3

Exam Tip

Aluminium oxide and zinc oxide are examples.

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Question 26/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

जिंक ऑक्साइड को उभयधर्मी क्यों कहा जाता है?

Why is zinc oxide called amphoteric?

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Correct Answer

A. क्योंकि यह अम्ल और क्षार दोनों से अभिक्रिया कर सकता हैBecause it can react with both acids and bases

Step 1

Concept

An amphoteric substance can show both types of behaviour.

Step 2

Why this answer is correct

Zinc oxide can react with acids as well as bases.

Step 3

Exam Tip

Therefore, it is called an amphoteric oxide.

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Question 27/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

नीले कॉपर सल्फेट को गरम करने पर सफेद ठोस बनता है। यह परिवर्तन किसके निकलने के कारण होता है?

When blue copper sulphate is heated, a white solid is formed. This change occurs due to the loss of what?

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Correct Answer

A. क्रिस्टलीय जलWater of crystallisation

Step 1

Concept

Blue copper sulphate contains water of crystallisation.

Step 2

Why this answer is correct

On heating, this water is lost.

Step 3

Exam Tip

Therefore, the blue colour changes to white.

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Question 28/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सफेद निर्जल कॉपर सल्फेट जल की उपस्थिति में नीला हो जाता है। यह किस परीक्षण में उपयोगी है?

White anhydrous copper sulphate turns blue in the presence of water. In which test is this useful?

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Correct Answer

A. जल की उपस्थिति की पहचानTest for presence of water

Step 1

Concept

Anhydrous copper sulphate is white.

Step 2

Why this answer is correct

It turns blue when water is present.

Step 3

Exam Tip

Therefore, it is used to test the presence of water.

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Question 29/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

प्लास्टर ऑफ पेरिस को नमी से दूर रखने का सबसे सही कारण क्या है?

What is the most correct reason for keeping plaster of Paris away from moisture?

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Correct Answer

A. नमी मिलने पर यह जम सकता हैIt can set on absorbing moisture

Step 1

Concept

Plaster of Paris reacts with water and becomes hard.

Step 2

Why this answer is correct

Moisture can make it set before use.

Step 3

Exam Tip

Therefore, it should be stored in a dry closed container.

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Question 30/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

जिप्सम को नियंत्रित रूप से गरम करने पर प्लास्टर ऑफ पेरिस बनता है। इसमें मुख्य परिवर्तन किससे जुड़ा है?

Plaster of Paris is formed by controlled heating of gypsum. The main change is related to what?

Explanation opens after your attempt
Correct Answer

A. क्रिस्टलीय जल की मात्रा में परिवर्तनChange in the amount of water of crystallisation

Step 1

Concept

Gypsum is hydrated calcium sulphate.

Step 2

Why this answer is correct

Controlled heating removes part of its water of crystallisation.

Step 3

Exam Tip

This forms plaster of Paris.

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Question 31/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

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

Which statement about a strong acid and a concentrated acid is correct?

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Correct Answer

B. प्रबलता आयनीकरण से और सांद्रता मात्रा से संबंधित हैStrength is related to ionisation and concentration is related to amount

Step 1

Concept

Strength tells how much an acid ionises in water.

Step 2

Why this answer is correct

Concentration tells how much acid is present in the solution.

Step 3

Exam Tip

These two ideas are different.

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Question 32/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

समान सांद्रता वाले हाइड्रोक्लोरिक अम्ल और एथेनोइक अम्ल में विद्युत चालकता किसकी अधिक होगी?

Between equal concentration solutions of hydrochloric acid and ethanoic acid, which will have higher electrical conductivity?

Explanation opens after your attempt
Correct Answer

A. हाइड्रोक्लोरिक अम्लHydrochloric acid

Step 1

Concept

Hydrochloric acid is a strong acid.

Step 2

Why this answer is correct

It produces more ions in water.

Step 3

Exam Tip

More ions lead to higher electrical conductivity.

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Question 33/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

शर्करा का जलीय विलयन बल्ब नहीं जलाता, जबकि अम्लीय विलयन जलाता है। सही कारण क्या है?

An aqueous sugar solution does not make a bulb glow, while an acidic solution does. What is the correct reason?

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Correct Answer

A. शर्करा विलयन में चलायमान आयन नहीं बनतेMobile ions are not formed in sugar solution

Step 1

Concept

Electric current needs mobile ions.

Step 2

Why this answer is correct

Acids form ions in water, but sugar generally does not.

Step 3

Exam Tip

Therefore, acid solution conducts while sugar solution may not.

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Question 34/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अम्लीय वर्षा में संगमरमर की मूर्तियों को क्षति क्यों होती है?

Why are marble statues damaged by acid rain?

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Correct Answer

A. संगमरमर में कैल्शियम कार्बोनेट होता है जो अम्ल से अभिक्रिया करता हैMarble contains calcium carbonate, which reacts with acid

Step 1

Concept

Marble contains calcium carbonate.

Step 2

Why this answer is correct

Acids can react with carbonates.

Step 3

Exam Tip

Therefore, acid rain slowly damages marble.

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Question 35/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अम्लीय वर्षा का जल जलीय जीवों के लिए कब अधिक हानिकारक हो सकता है?

When can acid rain water be more harmful to aquatic organisms?

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Correct Answer

A. जब जल का पीएच बहुत घट जाएWhen the pH of water decreases greatly

Step 1

Concept

Aquatic organisms survive within a suitable pH range.

Step 2

Why this answer is correct

Acid rain can lower water pH.

Step 3

Exam Tip

Very low pH is harmful to aquatic life.

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Question 36/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अम्ल को जल में घोलते समय पात्र गरम क्यों हो जाता है?

Why does the container become hot when acid is dissolved in water?

Explanation opens after your attempt
Correct Answer

A. क्योंकि ऊष्मा निकलती हैBecause heat is released

Step 1

Concept

Dissolving acid in water is an exothermic process.

Step 2

Why this answer is correct

Heat is released during this process.

Step 3

Exam Tip

Therefore, the container may feel hot.

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Question 37/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सांद्र अम्ल को पतला करने की सुरक्षित विधि कौन सी है?

What is the safe method for diluting concentrated acid?

Explanation opens after your attempt
Correct Answer

B. अम्ल को धीरे-धीरे जल में डालनाAdd acid slowly to water

Step 1

Concept

Dissolving acid in water can release a lot of heat.

Step 2

Why this answer is correct

Adding water to acid can cause splashing.

Step 3

Exam Tip

Therefore, acid should be added slowly to water.

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Question 38/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

घ्राण सूचक अम्ल और क्षार में किस परिवर्तन के आधार पर संकेत देते हैं?

Olfactory indicators give signals in acids and bases based on what change?

Explanation opens after your attempt
Correct Answer

A. गंध में परिवर्तनChange in smell

Step 1

Concept

Olfactory indicators work based on smell.

Step 2

Why this answer is correct

Their smell can change in acidic or basic media.

Step 3

Exam Tip

Onion and vanilla are examples.

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Question 39/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

हल्दी का दाग साबुन लगाने पर लाल भूरा हो जाता है। यह साबुन के किस स्वभाव का संकेत है?

A turmeric stain becomes reddish brown when soap is applied. This indicates which nature of soap?

Explanation opens after your attempt
Correct Answer

B. क्षारीय स्वभावBasic nature

Step 1

Concept

Turmeric is a natural indicator.

Step 2

Why this answer is correct

It becomes reddish brown in a basic medium.

Step 3

Exam Tip

Soap solution is generally basic.

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Question 40/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि किसी पदार्थ का जलीय विलयन खट्टा स्वाद रखता है और नीला लिटमस लाल करता है, तो वह किस श्रेणी में आएगा?

If an aqueous solution of a substance tastes sour and turns blue litmus red, which category does it belong to?

Explanation opens after your attempt
Correct Answer

A. अम्लAcid

Step 1

Concept

Sour taste is a common property of acids.

Step 2

Why this answer is correct

Turning blue litmus red is also a property of acids.

Step 3

Exam Tip

In the laboratory, substances should not be tested by taste.

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Question 41/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि किसी पदार्थ का विलयन स्पर्श में साबुन जैसा है और लाल लिटमस नीला करता है, तो वह किस प्रकार का होगा?

If a substance solution feels soapy and turns red litmus blue, what type is it?

Explanation opens after your attempt
Correct Answer

B. क्षारीयBasic

Step 1

Concept

Bases may feel soapy.

Step 2

Why this answer is correct

Bases turn red litmus blue.

Step 3

Exam Tip

Unknown substances should not be touched directly.

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Question 42/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सार्वत्रिक सूचक किसी विलयन में नारंगी रंग दिखाता है। विलयन की प्रकृति क्या हो सकती है?

A universal indicator shows orange colour in a solution. What could be the nature of the solution?

Explanation opens after your attempt
Correct Answer

A. अम्लीयAcidic

Step 1

Concept

Universal indicator gives a pH clue through colour.

Step 2

Why this answer is correct

Orange colour indicates an acidic range.

Step 3

Exam Tip

Green indicates neutrality.

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Question 43/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

सार्वत्रिक सूचक किसी विलयन में बैंगनी रंग दिखाता है। यह किस ओर संकेत करता है?

A universal indicator shows violet colour in a solution. What does this indicate?

Explanation opens after your attempt
Correct Answer

C. तीव्र क्षारीयताStrong basicity

Step 1

Concept

Universal indicator changes colour according to pH.

Step 2

Why this answer is correct

Violet indicates high pH and strong basicity.

Step 3

Exam Tip

A pH greater than 7 indicates a basic solution.

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Question 44/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

अम्लीय विलयन में जल मिलाने पर हाइड्रोजन आयनों की प्रति इकाई आयतन संख्या घटती है। इसका पीएच पर क्या प्रभाव होगा?

When water is added to an acidic solution, the number of hydrogen ions per unit volume decreases. What will be the effect on pH?

Explanation opens after your attempt
Correct Answer

A. पीएच बढ़ेगाpH will increase

Step 1

Concept

Acidity is related to hydrogen ions.

Step 2

Why this answer is correct

Adding water decreases hydrogen ions per unit volume.

Step 3

Exam Tip

Acidity decreases and pH increases.

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Question 45/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

क्षारीय विलयन में जल मिलाने पर हाइड्रॉक्साइड आयनों की प्रति इकाई आयतन संख्या घटती है। इसका पीएच पर क्या प्रभाव होगा?

When water is added to a basic solution, the number of hydroxide ions per unit volume decreases. What will be the effect on pH?

Explanation opens after your attempt
Correct Answer

B. पीएच सात की ओर घटेगाpH will decrease towards 7

Step 1

Concept

Basicity is related to hydroxide ions.

Step 2

Why this answer is correct

Adding water decreases hydroxide ions per unit volume.

Step 3

Exam Tip

Basicity decreases and pH moves towards 7.

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Question 46/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

किस युग्म में अम्ल और कार्बोनेट की अभिक्रिया से लवण, जल और कार्बन डाइऑक्साइड बनेंगे?

Which pair will react to form salt, water and carbon dioxide?

Explanation opens after your attempt
Correct Answer

A. हाइड्रोक्लोरिक अम्ल और सोडियम कार्बोनेटHydrochloric acid and sodium carbonate

Step 1

Concept

Acid and carbonate reaction produces carbon dioxide.

Step 2

Why this answer is correct

Salt and water are also formed.

Step 3

Exam Tip

Hydrochloric acid and sodium carbonate are the correct example.

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Question 47/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

किस युग्म की अभिक्रिया में मुख्य उत्पाद लवण और जल होंगे, पर गैस आवश्यक नहीं बनेगी?

Which pair will mainly form salt and water, but gas is not necessarily formed?

Explanation opens after your attempt
Correct Answer

C. अम्ल और क्षारAcid and base

Step 1

Concept

The reaction between an acid and a base is called neutralisation.

Step 2

Why this answer is correct

It generally forms salt and water.

Step 3

Exam Tip

Gas formation is common in acid-carbonate reactions.

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Question 48/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

किस युग्म की अभिक्रिया में लवण और हाइड्रोजन गैस बनती है?

Which pair reacts to form a salt and hydrogen gas?

Explanation opens after your attempt
Correct Answer

A. अम्ल और सक्रिय धातुAcid and reactive metal

Step 1

Concept

Reactive metals can react with acids.

Step 2

Why this answer is correct

This forms a salt and hydrogen gas.

Step 3

Exam Tip

Hydrogen is identified by the pop sound test.

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Question 49/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि किसी विलयन में पीएच सात से कम है और वह धातु कार्बोनेट से गैस निकालता है, तो वह विलयन क्या हो सकता है?

If a solution has pH less than 7 and releases gas with a metal carbonate, what could the solution be?

Explanation opens after your attempt
Correct Answer

A. अम्लीय विलयनAcidic solution

Step 1

Concept

pH less than 7 indicates acidity.

Step 2

Why this answer is correct

Acids release carbon dioxide from metal carbonates.

Step 3

Exam Tip

Both signs confirm an acidic solution.

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

यदि कोई विलयन लाल लिटमस को नीला करता है और पीएच दस दिखाता है, तो सबसे सही निष्कर्ष क्या होगा?

If a solution turns red litmus blue and shows pH 10, what is the most correct conclusion?

Explanation opens after your attempt
Correct Answer

C. वह क्षारीय हैIt is basic

Step 1

Concept

Red litmus turning blue indicates basicity.

Step 2

Why this answer is correct

pH 10 is greater than 7.

Step 3

Exam Tip

Both clues show that the solution is basic.

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