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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 7

अम्लीय विलयन नीले लिटमस पत्र पर क्या प्रभाव डालता है?

What effect does an acidic solution have on blue litmus paper?

Explanation opens after your attempt

Correct Answer

A. नीला लिटमस लाल हो जाता हैBlue litmus turns red

Step 1

Concept

Litmus is used to identify acidic and basic solutions.

Step 2

Why this answer is correct

An acid turns blue litmus red.

Step 3

Exam Tip

Remember the opposite effect for bases in exams.

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Question 2/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

क्षारीय विलयन लाल लिटमस पत्र पर क्या प्रभाव डालता है?

What effect does a basic solution have on red litmus paper?

Explanation opens after your attempt

Correct Answer

B. लाल लिटमस नीला हो जाता हैRed litmus turns blue

Step 1

Concept

Bases behave differently from acids.

Step 2

Why this answer is correct

A basic solution turns red litmus blue.

Step 3

Exam Tip

Litmus colour change is a quick identification test.

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Question 3/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

हल्दी के दाग पर साबुन लगाने से उसका रंग लाल भूरा क्यों हो जाता है?

Why does a turmeric stain become reddish brown when soap is applied?

Explanation opens after your attempt

Correct Answer

C. साबुन क्षारीय होता हैSoap is basic

Step 1

Concept

Turmeric is a natural indicator.

Step 2

Why this answer is correct

It turns reddish brown in a basic medium.

Step 3

Exam Tip

Natural indicator colour changes are common exam questions.

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Question 4/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

चींटी के डंक में उपस्थित अम्ल के प्रभाव को कम करने के लिए कौन सा पदार्थ लगाया जाता है?

Which substance is applied to reduce the effect of acid present in an ant sting?

Explanation opens after your attempt

Correct Answer

C. बेकिंग सोडा का विलयनBaking soda solution

Step 1

Concept

An ant sting contains an acidic substance.

Step 2

Why this answer is correct

Baking soda is mildly basic, so it neutralises the acid.

Step 3

Exam Tip

Acid-base reaction is called neutralisation.

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Question 5/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अम्ल और धातु की अभिक्रिया से सामान्यतः कौन सी गैस निकलती है?

Which gas is generally released when an acid reacts with a metal?

Explanation opens after your attempt

Correct Answer

D. हाइड्रोजनHydrogen

Step 1

Concept

Acids react with many reactive metals.

Step 2

Why this answer is correct

The products are a salt and hydrogen gas.

Step 3

Exam Tip

Hydrogen gives a pop sound near a burning splint.

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Question 6/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अम्ल और धातु कार्बोनेट की अभिक्रिया से कौन सी गैस निकलती है?

Which gas is released when an acid reacts with a metal carbonate?

Explanation opens after your attempt

Correct Answer

B. कार्बन डाइऑक्साइडCarbon dioxide

Step 1

Concept

Acids react with metal carbonates.

Step 2

Why this answer is correct

The products are salt, water, and carbon dioxide.

Step 3

Exam Tip

Carbon dioxide turns lime water milky.

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

चूने के पानी में कार्बन डाइऑक्साइड गैस प्रवाहित करने पर वह दूधिया क्यों हो जाता है?

Why does lime water turn milky when carbon dioxide gas is passed through it?

Explanation opens after your attempt

Correct Answer

A. कैल्शियम कार्बोनेट बनने के कारणDue to formation of calcium carbonate

Step 1

Concept

Lime water is a solution of calcium hydroxide.

Step 2

Why this answer is correct

Carbon dioxide forms calcium carbonate, which appears milky.

Step 3

Exam Tip

This is an important test for carbon dioxide.

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Question 8/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

जल में अम्ल घोलते समय कौन सा सुरक्षित तरीका अपनाना चाहिए?

What is the safe method for dissolving an acid in water?

Explanation opens after your attempt

Correct Answer

B. अम्ल को धीरे-धीरे जल में डालना चाहिएAcid should be added slowly to water

Step 1

Concept

Dissolving acid in water is an exothermic process.

Step 2

Why this answer is correct

Adding acid slowly to water reduces splashing risk.

Step 3

Exam Tip

Never add water directly to concentrated acid.

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

जलीय अम्ल विद्युत धारा का संचालन क्यों करते हैं?

Why do aqueous acids conduct electricity?

Explanation opens after your attempt

Correct Answer

C. क्योंकि वे आयन बनाते हैंBecause they produce ions

Step 1

Concept

Electric current needs charged particles to flow.

Step 2

Why this answer is correct

Acids produce ions in water, so they conduct electricity.

Step 3

Exam Tip

Dry acids generally do not show this behaviour.

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

क्षार जल में किस प्रकार के आयन देते हैं?

Which type of ions do bases produce in water?

Explanation opens after your attempt

Correct Answer

B. हाइड्रॉक्साइड आयनHydroxide ions

Step 1

Concept

The nature of a base is understood from the ions it forms in water.

Step 2

Why this answer is correct

Bases produce hydroxide ions in water.

Step 3

Exam Tip

Acids produce hydrogen ions, so keep the difference clear.

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

किस मान से कम पीएच वाला विलयन अम्लीय माना जाता है?

A solution with pH less than which value is considered acidic?

Explanation opens after your attempt

Correct Answer

A. सातSeven

Step 1

Concept

pH tells whether a solution is acidic or basic.

Step 2

Why this answer is correct

A pH less than 7 indicates an acidic solution.

Step 3

Exam Tip

A pH of 7 indicates a neutral solution.

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Question 12/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

शुद्ध जल का पीएच मान लगभग कितना होता है?

What is the approximate pH value of pure water?

Explanation opens after your attempt

Correct Answer

B. सातSeven

Step 1

Concept

Pure water is neither acidic nor basic.

Step 2

Why this answer is correct

Its pH is approximately 7.

Step 3

Exam Tip

Treat pH 7 as the standard for neutrality.

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Question 13/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

किस पीएच सीमा में विलयन क्षारीय माना जाता है?

In which pH range is a solution considered basic?

Explanation opens after your attempt

Correct Answer

C. सात से अधिकGreater than 7

Step 1

Concept

The pH scale shows acidity and basicity.

Step 2

Why this answer is correct

A solution with pH greater than 7 is basic.

Step 3

Exam Tip

Higher pH means stronger basic nature.

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Question 14/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

दाँतों का क्षय सामान्यतः किस पीएच से कम होने पर शुरू होता है?

Tooth decay generally starts when the pH falls below which value?

Explanation opens after your attempt

Correct Answer

C. पाँच दशमलव पाँच5.5

Step 1

Concept

Acids can form in the mouth after eating.

Step 2

Why this answer is correct

Tooth enamel starts getting affected when pH falls below about 5.5.

Step 3

Exam Tip

Basic toothpaste helps reduce acidity.

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Question 15/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अम्ल वर्षा सामान्य वर्षा की तुलना में अधिक हानिकारक क्यों होती है?

Why is acid rain more harmful than normal rain?

Explanation opens after your attempt

Correct Answer

A. क्योंकि उसका पीएच कम होता हैBecause its pH is lower

Step 1

Concept

Acid rain contains more acidic substances.

Step 2

Why this answer is correct

Its pH is lower than normal rain, making it more corrosive.

Step 3

Exam Tip

It can harm buildings, soil, and aquatic life.

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Question 16/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अपच के समय अम्लता कम करने के लिए किस प्रकार की औषधि ली जाती है?

Which type of medicine is taken to reduce acidity during indigestion?

Explanation opens after your attempt

Correct Answer

B. अम्लरोधीAntacid

Step 1

Concept

Excess acid in the stomach can cause burning and indigestion.

Step 2

Why this answer is correct

An antacid is mildly basic and neutralises excess acid.

Step 3

Exam Tip

This is a daily-life example of neutralisation.

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Question 17/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अत्यधिक अम्लीय मिट्टी को सुधारने के लिए कौन सा पदार्थ मिलाया जाता है?

Which substance is added to improve excessively acidic soil?

Explanation opens after your attempt

Correct Answer

A. चूनाLime

Step 1

Concept

Excessively acidic soil can harm plant growth.

Step 2

Why this answer is correct

Lime is basic and reduces acidity.

Step 3

Exam Tip

Remember different treatments for acidic and basic soils.

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Question 18/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अत्यधिक क्षारीय मिट्टी को सुधारने के लिए कौन सा पदार्थ मिलाया जा सकता है?

Which substance can be added to improve excessively basic soil?

Explanation opens after your attempt

Correct Answer

C. जैविक पदार्थOrganic matter

Step 1

Concept

Highly basic soil is not suitable for many plants.

Step 2

Why this answer is correct

Organic matter can release acids slowly and reduce basicity.

Step 3

Exam Tip

Understand the reason behind soil treatment, not just the name.

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Question 19/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

उदासीनीकरण अभिक्रिया में सामान्यतः क्या बनता है?

What is generally formed in a neutralisation reaction?

Explanation opens after your attempt

Correct Answer

B. लवण और जलSalt and water

Step 1

Concept

Neutralisation is a reaction between an acid and a base.

Step 2

Why this answer is correct

It generally forms salt and water.

Step 3

Exam Tip

Antacid action is a useful daily-life example.

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Question 20/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

सोडियम हाइड्रॉक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया से कौन सा लवण बनता है?

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

Explanation opens after your attempt

Correct Answer

A. सोडियम क्लोराइडSodium chloride

Step 1

Concept

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

Step 2

Why this answer is correct

Their reaction forms sodium chloride and water.

Step 3

Exam Tip

The salt name comes from the ions of the acid and base.

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Question 21/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

सामान्य नमक का रासायनिक नाम क्या है?

What is the chemical name of common salt?

Explanation opens after your attempt

Correct Answer

B. सोडियम क्लोराइडSodium chloride

Step 1

Concept

Common salt is used in food.

Step 2

Why this answer is correct

Its chemical name is sodium chloride.

Step 3

Exam Tip

It is a raw material for many useful chemicals.

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Question 22/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

नमकीन जल के विद्युत अपघटन से बनने वाली प्रक्रिया को क्या कहा जाता है?

What is the process of electrolysis of brine called?

Explanation opens after your attempt

Correct Answer

B. क्लोर क्षार प्रक्रियाChlor-alkali process

Step 1

Concept

Brine is an aqueous solution of sodium chloride.

Step 2

Why this answer is correct

Its electrolysis forms chlorine, hydrogen, and sodium hydroxide.

Step 3

Exam Tip

This industrial process is called the chlor-alkali process.

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Question 23/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

क्लोर क्षार प्रक्रिया में धनाग्र पर कौन सी गैस बनती है?

Which gas is formed at the anode in the chlor-alkali process?

Explanation opens after your attempt

Correct Answer

C. क्लोरीनChlorine

Step 1

Concept

The chlor-alkali process involves electrolysis of brine.

Step 2

Why this answer is correct

Chlorine gas is produced at the anode.

Step 3

Exam Tip

Hydrogen is produced at the cathode, so remember both electrodes.

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Question 24/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

क्लोर क्षार प्रक्रिया में ऋणाग्र पर कौन सी गैस बनती है?

Which gas is formed at the cathode in the chlor-alkali process?

Explanation opens after your attempt

Correct Answer

A. हाइड्रोजनHydrogen

Step 1

Concept

The chlor-alkali process gives several products from brine.

Step 2

Why this answer is correct

Hydrogen gas is formed at the cathode.

Step 3

Exam Tip

Make a table of anode and cathode products for revision.

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Question 25/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

विरंजक चूर्ण बनाने में कौन सा पदार्थ मुख्य रूप से उपयोग किया जाता है?

Which substance is mainly used to prepare bleaching powder?

Explanation opens after your attempt

Correct Answer

A. सूखा बुझा हुआ चूना और क्लोरीनDry slaked lime and chlorine

Step 1

Concept

Bleaching powder is a chlorine-related product.

Step 2

Why this answer is correct

It is made by passing chlorine over dry slaked lime.

Step 3

Exam Tip

Both its preparation and uses are important for exams.

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Question 26/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

विरंजक चूर्ण का उपयोग किस कार्य में किया जाता है?

For which purpose is bleaching powder used?

Explanation opens after your attempt

Correct Answer

A. जल को कीटाणुरहित करने मेंDisinfecting water

Step 1

Concept

Bleaching powder has disinfecting properties.

Step 2

Why this answer is correct

It is used to disinfect drinking water.

Step 3

Exam Tip

It is also used for bleaching in textile and paper industries.

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Question 27/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

बेकिंग सोडा का रासायनिक नाम क्या है?

What is the chemical name of baking soda?

Explanation opens after your attempt

Correct Answer

C. सोडियम हाइड्रोजन कार्बोनेटSodium hydrogen carbonate

Step 1

Concept

Baking soda is useful in cooking and medicine.

Step 2

Why this answer is correct

Its chemical name is sodium hydrogen carbonate.

Step 3

Exam Tip

Do not confuse baking soda with washing soda.

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Question 28/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

बेकिंग पाउडर में बेकिंग सोडा के साथ सामान्यतः क्या मिलाया जाता है?

What is generally mixed with baking soda in baking powder?

Explanation opens after your attempt

Correct Answer

A. हल्का खाद्य अम्लMild edible acid

Step 1

Concept

Baking powder contains baking soda and a mild edible acid.

Step 2

Why this answer is correct

On heating, carbon dioxide is released and makes cakes rise.

Step 3

Exam Tip

Baking soda alone can give a bitter taste.

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Question 29/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

केक और ब्रेड को फुलाने में बेकिंग पाउडर से कौन सी गैस निकलती है?

Which gas released from baking powder helps cakes and bread rise?

Explanation opens after your attempt

Correct Answer

C. कार्बन डाइऑक्साइडCarbon dioxide

Step 1

Concept

Baking powder reacts on heating.

Step 2

Why this answer is correct

It releases carbon dioxide gas.

Step 3

Exam Tip

The gas bubbles make the dough or batter light and fluffy.

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Question 30/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

वाशिंग सोडा का रासायनिक नाम क्या है?

What is the chemical name of washing soda?

Explanation opens after your attempt

Correct Answer

B. सोडियम कार्बोनेट दशजलSodium carbonate decahydrate

Step 1

Concept

Washing soda is useful for washing clothes and softening hard water.

Step 2

Why this answer is correct

Its chemical name is sodium carbonate decahydrate.

Step 3

Exam Tip

Decahydrate means it contains ten molecules of water of crystallisation.

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Question 31/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

वाशिंग सोडा का एक प्रमुख उपयोग क्या है?

What is one major use of washing soda?

Explanation opens after your attempt

Correct Answer

A. जल की स्थायी कठोरता दूर करनाRemoving permanent hardness of water

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

Therefore, it is used to soften hard water.

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Question 32/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

क्रिस्टलीय जल का क्या अर्थ है?

What does water of crystallisation mean?

Explanation opens after your attempt

Correct Answer

A. लवण में उपस्थित निश्चित मात्रा का जलFixed amount of water present in a salt crystal

Step 1

Concept

Some salt crystals contain a fixed amount of water.

Step 2

Why this answer is correct

This water is called water of crystallisation.

Step 3

Exam Tip

It can affect the shape and colour of crystals.

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Question 33/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

नीले कॉपर सल्फेट क्रिस्टल को गरम करने पर वे सफेद क्यों हो जाते हैं?

Why do blue copper sulphate crystals turn white on heating?

Explanation opens after your attempt

Correct Answer

B. क्योंकि क्रिस्टलीय जल निकल जाता हैBecause water of crystallisation is lost

Step 1

Concept

Blue copper sulphate contains water of crystallisation.

Step 2

Why this answer is correct

On heating, this water is lost and the substance turns white.

Step 3

Exam Tip

Adding water can restore the blue colour.

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Question 34/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

प्लास्टर ऑफ पेरिस किससे बनाया जाता है?

From which substance is plaster of Paris prepared?

Explanation opens after your attempt

Correct Answer

A. जिप्सम को गरम करकेBy heating gypsum

Step 1

Concept

Gypsum is a hydrated form of calcium sulphate.

Step 2

Why this answer is correct

Plaster of Paris is prepared by heating gypsum at a controlled temperature.

Step 3

Exam Tip

Controlled heating is important because overheating changes its properties.

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Question 35/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

प्लास्टर ऑफ पेरिस का उपयोग टूटी हड्डी पर पट्टी बनाने में क्यों किया जाता है?

Why is plaster of Paris used for making casts on fractured bones?

Explanation opens after your attempt

Correct Answer

A. यह जल मिलाने पर जल्दी कठोर हो जाता हैIt sets hard quickly on adding water

Step 1

Concept

Plaster of Paris forms a hard gypsum-like substance when mixed with water.

Step 2

Why this answer is correct

It sets quickly and helps keep the fractured bone stable.

Step 3

Exam Tip

Link its setting property with its medical use.

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Question 36/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

निम्न में से कौन सा पदार्थ प्रबल अम्ल का उदाहरण है?

Which of the following is an example of a strong acid?

Explanation opens after your attempt

Correct Answer

A. हाइड्रोक्लोरिक अम्लHydrochloric acid

Step 1

Concept

Strong acids ionise almost completely in water.

Step 2

Why this answer is correct

Hydrochloric acid is a strong acid.

Step 3

Exam Tip

Acetic acid is a common example of a weak acid.

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Question 37/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

निम्न में से कौन सा कमजोर अम्ल का उदाहरण है?

Which of the following is an example of a weak acid?

Explanation opens after your attempt

Correct Answer

D. सिरके का अम्लAcetic acid

Step 1

Concept

Weak acids ionise only partially in water.

Step 2

Why this answer is correct

Acetic acid is a weak acid.

Step 3

Exam Tip

Distinguish strong and weak acids on the basis of ionisation.

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Question 38/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

सांद्र अम्ल और तनु अम्ल में मुख्य अंतर किस आधार पर होता है?

What is the main basis of difference between concentrated acid and dilute acid?

Explanation opens after your attempt

Correct Answer

A. अम्ल की मात्रा प्रति विलयनAmount of acid per solution

Step 1

Concept

Concentration tells how much acid is present in a solution.

Step 2

Why this answer is correct

Concentrated acid has more acid, while dilute acid has less acid.

Step 3

Exam Tip

Do not confuse strength with concentration.

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Question 39/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

जल में अम्ल मिलाने पर उत्पन्न ऊष्मा के कारण विलयन का तापमान कैसा होता है?

What happens to the temperature of the solution when acid is mixed with water?

Explanation opens after your attempt

Correct Answer

B. तापमान बढ़ता हैTemperature increases

Step 1

Concept

Dissolving acid in water releases heat.

Step 2

Why this answer is correct

The released heat raises the temperature of the solution.

Step 3

Exam Tip

This is why acid is added slowly to water.

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Question 40/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

शुष्क हाइड्रोक्लोरिक गैस सूखे लिटमस पत्र का रंग क्यों नहीं बदलती?

Why does dry hydrogen chloride gas not change the colour of dry litmus paper?

Explanation opens after your attempt

Correct Answer

A. क्योंकि जल की अनुपस्थिति में आयन नहीं बनतेBecause ions are not formed in the absence of water

Step 1

Concept

Water is needed for acids to show acidic behaviour.

Step 2

Why this answer is correct

In dry conditions, hydrogen ions are not produced, so dry litmus does not change.

Step 3

Exam Tip

Moist litmus can show the colour change.

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Question 41/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अम्लीय विलयन में हाइड्रोजन आयन की मात्रा बढ़ने पर पीएच मान पर क्या प्रभाव पड़ता है?

What happens to the pH value when the concentration of hydrogen ions increases in an acidic solution?

Explanation opens after your attempt

Correct Answer

B. पीएच घटता हैpH decreases

Step 1

Concept

Acidity is related to hydrogen ion concentration.

Step 2

Why this answer is correct

More hydrogen ions mean higher acidity and lower pH.

Step 3

Exam Tip

Lower pH means stronger acidic nature.

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Question 42/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

समान सांद्रता वाले दो अम्लों में जिसका पीएच कम है, वह कैसा होगा?

Among two acids of the same concentration, the one with lower pH will be what?

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Correct Answer

A. अधिक अम्लीयMore acidic

Step 1

Concept

Lower pH means higher acidity.

Step 2

Why this answer is correct

At the same concentration, an acid with lower pH produces more hydrogen ions.

Step 3

Exam Tip

Use pH to compare acidity.

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Question 43/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

निम्न में से कौन सा पदार्थ अम्लीय प्रकृति का होता है?

Which of the following substances is acidic in nature?

Explanation opens after your attempt

Correct Answer

B. नींबू रसLemon juice

Step 1

Concept

Lemon juice contains a natural acid.

Step 2

Why this answer is correct

Therefore, it is acidic in nature.

Step 3

Exam Tip

Soap and baking soda solutions generally show basic nature.

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Question 44/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

निम्न में से कौन सा पदार्थ क्षारीय प्रकृति का होता है?

Which of the following substances is basic in nature?

Explanation opens after your attempt

Correct Answer

C. साबुन विलयनSoap solution

Step 1

Concept

Soap solution is generally basic.

Step 2

Why this answer is correct

It can turn red litmus blue.

Step 3

Exam Tip

Vinegar, lemon, and tamarind are examples of acidic substances.

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Question 45/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

मिथाइल ऑरेंज सूचक अम्लीय विलयन में कौन सा रंग दिखाता है?

What colour does methyl orange indicator show in an acidic solution?

Explanation opens after your attempt

Correct Answer

B. लालRed

Step 1

Concept

Methyl orange is a synthetic indicator.

Step 2

Why this answer is correct

It shows red colour in an acidic solution.

Step 3

Exam Tip

Revise indicator colour changes in a separate list.

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Question 46/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

फिनॉल्फ्थेलीन क्षारीय विलयन में कौन सा रंग देती है?

What colour does phenolphthalein show in a basic solution?

Explanation opens after your attempt

Correct Answer

A. गुलाबीPink

Step 1

Concept

Phenolphthalein is a common synthetic indicator.

Step 2

Why this answer is correct

It turns pink in a basic solution.

Step 3

Exam Tip

It remains colourless in an acidic solution.

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Question 47/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अम्ल और क्षार की अभिक्रिया में ताप बढ़ना किस बात का संकेत है?

A rise in temperature during an acid-base reaction indicates what?

Explanation opens after your attempt

Correct Answer

A. ऊष्मा का उत्सर्जनRelease of heat

Step 1

Concept

Many neutralisation reactions release heat.

Step 2

Why this answer is correct

A rise in temperature indicates release of heat.

Step 3

Exam Tip

Such a reaction is called exothermic.

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Question 48/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अम्ल और धातु ऑक्साइड की अभिक्रिया में क्या बनता है?

What is formed when an acid reacts with a metal oxide?

Explanation opens after your attempt

Correct Answer

A. लवण और जलSalt and water

Step 1

Concept

Metal oxides are generally basic in nature.

Step 2

Why this answer is correct

They react with acids to form salt and water.

Step 3

Exam Tip

Hence, metal oxides are also called basic oxides.

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Question 49/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 7

अधातु ऑक्साइड सामान्यतः किस प्रकृति के होते हैं?

Non-metal oxides are generally of which nature?

Explanation opens after your attempt

Correct Answer

B. अम्लीयAcidic

Step 1

Concept

Most non-metal oxides can form acidic solutions with water.

Step 2

Why this answer is correct

Therefore, non-metal oxides are generally acidic in nature.

Step 3

Exam Tip

Remember the comparison: metal oxides are generally basic.

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

यदि किसी विलयन का पीएच दो है, तो वह किस प्रकृति का होगा?

If a solution has pH 2, what will be its nature?

Explanation opens after your attempt

Correct Answer

A. तीव्र अम्लीयStrongly acidic

Step 1

Concept

A solution with pH less than 7 is acidic.

Step 2

Why this answer is correct

pH 2 is a very low value, so the solution is strongly acidic.

Step 3

Exam Tip

On the pH scale, values near 0 indicate high acidity.

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

अम्लीय विलयन नीले लिटमस पत्र पर क्या प्रभाव डालता है?

Concept

Why this answer is correct

Exam Tip

क्षारीय विलयन लाल लिटमस पत्र पर क्या प्रभाव डालता है?

Concept

Why this answer is correct

Exam Tip

हल्दी के दाग पर साबुन लगाने से उसका रंग लाल भूरा क्यों हो जाता है?

Concept

Why this answer is correct

Exam Tip

चींटी के डंक में उपस्थित अम्ल के प्रभाव को कम करने के लिए कौन सा पदार्थ लगाया जाता है?

Concept

Why this answer is correct

Exam Tip

अम्ल और धातु की अभिक्रिया से सामान्यतः कौन सी गैस निकलती है?

Concept

Why this answer is correct

Exam Tip

अम्ल और धातु कार्बोनेट की अभिक्रिया से कौन सी गैस निकलती है?

Concept

Why this answer is correct

Exam Tip

चूने के पानी में कार्बन डाइऑक्साइड गैस प्रवाहित करने पर वह दूधिया क्यों हो जाता है?

Concept

Why this answer is correct

Exam Tip

जल में अम्ल घोलते समय कौन सा सुरक्षित तरीका अपनाना चाहिए?

Concept

Why this answer is correct

Exam Tip

जलीय अम्ल विद्युत धारा का संचालन क्यों करते हैं?

Concept

Why this answer is correct

Exam Tip

क्षार जल में किस प्रकार के आयन देते हैं?

Concept

Why this answer is correct

Exam Tip

किस मान से कम पीएच वाला विलयन अम्लीय माना जाता है?

Concept

Why this answer is correct

Exam Tip

शुद्ध जल का पीएच मान लगभग कितना होता है?

Concept

Why this answer is correct

Exam Tip

किस पीएच सीमा में विलयन क्षारीय माना जाता है?

Concept

Why this answer is correct

Exam Tip

दाँतों का क्षय सामान्यतः किस पीएच से कम होने पर शुरू होता है?

Concept

Why this answer is correct

Exam Tip

अम्ल वर्षा सामान्य वर्षा की तुलना में अधिक हानिकारक क्यों होती है?

Concept

Why this answer is correct

Exam Tip

अपच के समय अम्लता कम करने के लिए किस प्रकार की औषधि ली जाती है?

Concept

Why this answer is correct

Exam Tip

अत्यधिक अम्लीय मिट्टी को सुधारने के लिए कौन सा पदार्थ मिलाया जाता है?

Concept

Why this answer is correct

Exam Tip

अत्यधिक क्षारीय मिट्टी को सुधारने के लिए कौन सा पदार्थ मिलाया जा सकता है?

Concept

Why this answer is correct

Exam Tip

उदासीनीकरण अभिक्रिया में सामान्यतः क्या बनता है?

Concept

Why this answer is correct

Exam Tip

सोडियम हाइड्रॉक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया से कौन सा लवण बनता है?

Concept

Why this answer is correct