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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 691/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

एक छात्र ने प्रयोगशाला में अज्ञात विलयन को छूकर पहचानने की कोशिश की। यह तरीका गलत क्यों है?

A student tried to identify an unknown solution by touching it in the laboratory. Why is this method wrong?

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Correct Answer

A. क्योंकि अम्ल और क्षार संक्षारक या हानिकारक हो सकते हैंBecause acids and bases may be corrosive or harmful

Step 1

Concept

Many acids and bases can harm the skin.

Step 2

Why this answer is correct

Touching an unknown solution directly is unsafe.

Step 3

Exam Tip

Use safe indicators and proper laboratory methods for identification.

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Question 692/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

यदि किसी विलयन में लाल और नीले लिटमस दोनों का रंग न बदले, तो आगे कौन सा परीक्षण अधिक स्पष्टता दे सकता है?

If a solution does not change either red or blue litmus, which test can give more clarity?

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Correct Answer

A. सार्वत्रिक सूचक से पीएच जाँचनाChecking pH with universal indicator

Step 1

Concept

Litmus gives only a general acidic or basic indication.

Step 2

Why this answer is correct

Universal indicator gives a clearer idea of pH.

Step 3

Exam Tip

Tasting or touching unknown substances is unsafe.

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Question 693/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

जल में अम्ल मिलाते समय अम्ल को धीरे-धीरे जल में डालना क्यों चाहिए?

Why should acid be added slowly to water while mixing acid with water?

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Correct Answer

A. क्योंकि प्रक्रिया ऊष्मा छोड़ती है और छींटे पड़ सकते हैंBecause the process releases heat and may cause splashing

Step 1

Concept

Dissolving acid in water is an exothermic process.

Step 2

Why this answer is correct

Excess heat can cause acid splashing.

Step 3

Exam Tip

Therefore, the safe method is to add acid slowly to water.

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Question 694/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

सांद्र अम्ल में सीधे जल डालने से दुर्घटना क्यों हो सकती है?

Why can adding water directly to concentrated acid cause an accident?

Explanation opens after your attempt
Correct Answer

A. क्योंकि अचानक ऊष्मा निकलने से अम्ल उछल सकता हैBecause sudden heat release can cause acid to splash

Step 1

Concept

Adding water to concentrated acid can produce intense heat.

Step 2

Why this answer is correct

This may cause acid to splash and harm skin or eyes.

Step 3

Exam Tip

Always add acid slowly to water.

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Question 695/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस कथन से स्पष्ट होता है कि उदासीनीकरण अभिक्रिया में ऊष्मा निकल सकती है?

Which statement shows that heat can be released in a neutralisation reaction?

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Correct Answer

A. अम्ल और क्षार मिलाने पर पात्र गरम महसूस होता हैThe container feels warm when acid and base are mixed

Step 1

Concept

Many neutralisation reactions are exothermic.

Step 2

Why this answer is correct

The container feeling warm indicates heat release.

Step 3

Exam Tip

Acid and base generally form salt and water.

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Question 696/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

यदि पीएच मान सात से घटकर तीन हो जाए, तो विलयन की प्रकृति में क्या परिवर्तन होगा?

If the pH value decreases from 7 to 3, what change occurs in the nature of the solution?

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Correct Answer

A. विलयन अधिक अम्लीय हो जाएगाThe solution becomes more acidic

Step 1

Concept

pH 7 indicates neutrality.

Step 2

Why this answer is correct

A pH below 7 indicates acidity.

Step 3

Exam Tip

pH 3 is quite low, so acidity increases.

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Question 697/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

यदि पीएच मान सात से बढ़कर ग्यारह हो जाए, तो विलयन की प्रकृति कैसी होगी?

If the pH value increases from 7 to 11, what will be the nature of the solution?

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Correct Answer

B. क्षारीयBasic

Step 1

Concept

pH 7 is the value for a neutral solution.

Step 2

Why this answer is correct

A pH greater than 7 indicates a basic solution.

Step 3

Exam Tip

pH 11 clearly shows basic nature.

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Question 698/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस युग्म में पहला पदार्थ अम्लीय और दूसरा क्षारीय है?

In which pair is the first substance acidic and the second substance basic?

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Correct Answer

A. नींबू रस और साबुन विलयनLemon juice and soap solution

Step 1

Concept

Lemon juice contains acidic substances.

Step 2

Why this answer is correct

Soap solution is generally basic.

Step 3

Exam Tip

Connect daily-life substances with their pH nature for revision.

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Question 699/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस युग्म में दोनों पदार्थ क्षारीय प्रकृति दिखा सकते हैं?

In which pair can both substances show basic nature?

Explanation opens after your attempt
Correct Answer

B. साबुन विलयन और बेकिंग सोडा विलयनSoap solution and baking soda solution

Step 1

Concept

Soap solution is basic in nature.

Step 2

Why this answer is correct

Baking soda solution is also mildly basic.

Step 3

Exam Tip

Vinegar, lemon and tamarind are examples of acidic substances.

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Question 700/1900 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस युग्म में दोनों पदार्थ अम्लीय प्रकृति दिखा सकते हैं?

In which pair can both substances show acidic nature?

Explanation opens after your attempt
Correct Answer

A. नींबू रस और सिरकाLemon juice and vinegar

Step 1

Concept

Lemon juice contains a natural acid.

Step 2

Why this answer is correct

Vinegar is also an example of an acidic substance.

Step 3

Exam Tip

Acidic substances can generally turn blue litmus red.

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