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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 641/1900 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?

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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 642/1900 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?

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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 643/1900 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?

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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 644/1900 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?

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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 645/1900 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?

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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 646/1900 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?

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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 647/1900 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?

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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 648/1900 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?

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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 649/1900 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?

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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 650/1900 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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