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Science Acids, Bases, and Salts MCQ Questions for Class 10

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Acids, Bases, and Salts Practice Questions

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Question 551/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

यदि किसी विलयन का पीएच मान तीन से बढ़कर छह हो जाए, तो उसकी अम्लीयता में क्या परिवर्तन होगा?

If the pH of a solution increases from 3 to 6, what happens to its acidity?

Explanation opens after your attempt
Correct Answer

A. अम्लीयता घटेगीAcidity will decrease

Step 1

Concept

Lower pH means higher acidity.

Step 2

Why this answer is correct

When pH increases from 3 to 6, acidity decreases.

Step 3

Exam Tip

Since pH is still below 7, the solution remains acidic.

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Question 552/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

यदि एक विलयन लाल लिटमस को नीला कर देता है और हल्दी को लाल भूरा कर देता है, तो उसका स्वभाव कैसा होगा?

If a solution turns red litmus blue and turmeric reddish brown, what is its nature?

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Correct Answer

B. क्षारीयBasic

Step 1

Concept

Turning red litmus blue is a property of bases.

Step 2

Why this answer is correct

Turmeric becoming reddish brown also indicates a basic medium.

Step 3

Exam Tip

When two indicators give the same clue, the identification is stronger.

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Question 553/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

मैग्नीशियम पट्टी को तनु हाइड्रोक्लोरिक अम्ल में डालने पर बने लवण का नाम क्या होगा?

What is the name of the salt formed when a magnesium ribbon is added to dilute hydrochloric acid?

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Correct Answer

C. मैग्नीशियम क्लोराइडMagnesium chloride

Step 1

Concept

A metal reacts with an acid to form a salt and hydrogen gas.

Step 2

Why this answer is correct

Magnesium reacts with hydrochloric acid to form magnesium chloride.

Step 3

Exam Tip

The salt name depends on the metal and the acid radical.

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Question 554/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

जस्ता और तनु सल्फ्यूरिक अम्ल की अभिक्रिया में कौन सा लवण बनता है?

Which salt is formed when zinc reacts with dilute sulphuric acid?

Explanation opens after your attempt
Correct Answer

D. जिंक सल्फेटZinc sulphate

Step 1

Concept

Zinc is a reactive metal and can react with acids.

Step 2

Why this answer is correct

With sulphuric acid, it forms zinc sulphate and hydrogen gas.

Step 3

Exam Tip

Changing the acid changes the salt formed.

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Question 555/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

जल में घुले अम्ल में बल्ब चमकता है, पर शुष्क अम्लीय गैस में नहीं। इसका सही कारण क्या है?

A bulb glows in an aqueous acid but not in dry acidic gas. What is the correct reason?

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Correct Answer

A. जल की उपस्थिति में चलायमान आयन बनते हैंMobile ions are produced in the presence of water

Step 1

Concept

Electric current needs mobile charged particles.

Step 2

Why this answer is correct

Acids form ions in water, so current can pass.

Step 3

Exam Tip

In dry conditions, ions are not available, so the bulb does not glow.

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Question 556/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

सोडियम कार्बोनेट में तनु हाइड्रोक्लोरिक अम्ल मिलाने पर कौन से उत्पाद बनेंगे?

What products are formed when dilute hydrochloric acid is added to sodium carbonate?

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Correct Answer

B. सोडियम क्लोराइड, जल और कार्बन डाइऑक्साइडSodium chloride, water and carbon dioxide

Step 1

Concept

Carbonates react with acids to release carbon dioxide.

Step 2

Why this answer is correct

Sodium carbonate and hydrochloric acid form sodium chloride, water and carbon dioxide.

Step 3

Exam Tip

The gas can be tested with lime water.

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Question 557/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

किस प्रयोग में चूने के पानी का दूधिया होना सबसे उपयोगी पहचान है?

In which experiment is the milky appearance of lime water the most useful test?

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Correct Answer

C. कार्बन डाइऑक्साइड गैस की पहचानIdentification of carbon dioxide gas

Step 1

Concept

Carbon dioxide reacts with lime water.

Step 2

Why this answer is correct

Insoluble calcium carbonate is formed, making lime water milky.

Step 3

Exam Tip

This test identifies the gas released from acid-carbonate reactions.

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Question 558/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

अधिक कार्बन डाइऑक्साइड प्रवाहित करने पर दूधिया चूने का पानी फिर साफ क्यों हो सकता है?

Why can milky lime water become clear again when excess carbon dioxide is passed?

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Correct Answer

D. क्योंकि घुलनशील कैल्शियम हाइड्रोजन कार्बोनेट बनता हैBecause soluble calcium hydrogen carbonate is formed

Step 1

Concept

Carbon dioxide first forms calcium carbonate, causing milkiness.

Step 2

Why this answer is correct

Excess carbon dioxide can form soluble calcium hydrogen carbonate.

Step 3

Exam Tip

Therefore, the solution may become clear again.

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Question 559/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

अम्ल का तनुकरण करते समय काँच के पात्र की बाहरी सतह गरम महसूस होती है। यह किस प्रकार की प्रक्रिया को दर्शाता है?

During dilution of an acid, the outer surface of the glass container feels hot. What type of process does this show?

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Correct Answer

A. ऊष्माक्षेपी प्रक्रियाExothermic process

Step 1

Concept

During dilution, acid dissolves in water.

Step 2

Why this answer is correct

Heat is released, so the container feels hot.

Step 3

Exam Tip

Acid should always be added slowly to water.

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Question 560/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

एक छात्र ने जल को सांद्र अम्ल में डाल दिया। यह खतरनाक क्यों है?

A student added water to concentrated acid. Why is this dangerous?

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Correct Answer

B. क्योंकि तीव्र ऊष्मा से अम्ल के छींटे पड़ सकते हैंBecause intense heat may cause acid splashing

Step 1

Concept

Adding water to concentrated acid releases a lot of heat.

Step 2

Why this answer is correct

The mixture may splash and cause burns.

Step 3

Exam Tip

The safe method is to add acid slowly to water.

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