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

Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.

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Acids, Bases, and Salts Practice Questions

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अधातु ऑक्साइड को अम्लीय ऑक्साइड क्यों कहा जाता है?

Why are non-metal oxides called acidic oxides?

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Correct Answer

A. क्योंकि वे जल में मिलकर अम्लीय विलयन बना सकते हैंBecause they can form acidic solutions with water

Step 1

Concept

Many non-metal oxides react with water to form acids.

Step 2

Why this answer is correct

Therefore, they are called acidic oxides.

Step 3

Exam Tip

Remember examples like carbon dioxide and sulphur dioxide.

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धातु ऑक्साइड अम्लों से अभिक्रिया करके लवण और जल बनाते हैं। इससे उनका कौन सा स्वभाव सिद्ध होता है?

Metal oxides react with acids to form salt and water. What nature does this prove?

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Correct Answer

B. क्षारीय स्वभावBasic nature

Step 1

Concept

A base reacts with an acid to form salt and water.

Step 2

Why this answer is correct

Metal oxides show the same behaviour with acids.

Step 3

Exam Tip

Therefore, most metal oxides are called basic oxides.

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अम्ल और क्षार की अभिक्रिया में यदि कोई सूचक रंग बदलना बंद कर दे, तो यह किस स्थिति का संकेत हो सकता है?

In an acid-base reaction, if an indicator stops changing colour, what condition may it indicate?

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Correct Answer

C. उदासीनीकरण के पास की स्थितिA condition near neutralisation

Step 1

Concept

An indicator shows whether a solution is acidic or basic.

Step 2

Why this answer is correct

When acid and base are mixed in suitable amounts, the solution can approach neutralisation.

Step 3

Exam Tip

In titration-like experiments, a colour change endpoint is important.

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घ्राण सूचक किस आधार पर अम्ल और क्षार की पहचान में सहायता करते हैं?

On what basis do olfactory indicators help identify acids and bases?

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Correct Answer

B. गंध में परिवर्तन सेBy change in smell

Step 1

Concept

Olfactory indicators are substances whose smell can change in acidic or basic media.

Step 2

Why this answer is correct

Onion, clove and vanilla are examples.

Step 3

Exam Tip

Indicators can give clues by smell, not only by colour.

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प्याज का रस किस प्रकार के सूचक का उदाहरण है?

Onion juice is an example of which type of indicator?

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Correct Answer

A. घ्राण सूचकOlfactory indicator

Step 1

Concept

The smell of onion can behave differently in acidic and basic media.

Step 2

Why this answer is correct

Therefore, onion juice is an olfactory indicator.

Step 3

Exam Tip

Identify olfactory indicators by smell change.

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यदि किसी विलयन में फिनॉल्फ्थेलीन रंगहीन रहती है, तो कौन सा निष्कर्ष सबसे सावधानीपूर्वक माना जाएगा?

If phenolphthalein remains colourless in a solution, which conclusion is the most careful one?

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Correct Answer

B. विलयन अम्लीय या उदासीन हो सकता हैThe solution may be acidic or neutral

Step 1

Concept

Phenolphthalein turns pink in a basic solution.

Step 2

Why this answer is correct

It can remain colourless in acidic or neutral solutions.

Step 3

Exam Tip

Be careful when drawing conclusions from only one indicator.

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मिथाइल ऑरेंज क्षारीय विलयन में सामान्यतः कौन सा रंग दिखाता है?

What colour does methyl orange generally show in a basic solution?

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Correct Answer

C. पीलाYellow

Step 1

Concept

Methyl orange gives different colours in acidic and basic solutions.

Step 2

Why this answer is correct

It is red in acidic solution and yellow in basic solution.

Step 3

Exam Tip

Learn indicator colour changes in pairs.

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एक विलयन नीले लिटमस को लाल कर देता है और धातु कार्बोनेट से गैस निकालता है। वह विलयन किस प्रकार का होगा?

A solution turns blue litmus red and releases gas with a metal carbonate. What type of solution is it?

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Correct Answer

D. अम्लीयAcidic

Step 1

Concept

Turning blue litmus red indicates acidic nature.

Step 2

Why this answer is correct

Acids react with metal carbonates to release carbon dioxide gas.

Step 3

Exam Tip

Both observations confirm acidic nature.

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यदि किसी अम्ल की थोड़ी मात्रा जल में मिलाई जाए, तो विलयन में किस आयन की मात्रा बढ़ती है?

When a small amount of acid is mixed with water, the amount of which ion increases in the solution?

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Correct Answer

B. हाइड्रोजन आयनHydrogen ion

Step 1

Concept

Acids give hydrogen ions in aqueous solution.

Step 2

Why this answer is correct

This is why the solution shows acidic character.

Step 3

Exam Tip

For bases, focus on hydroxide ions.

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यदि किसी क्षार की थोड़ी मात्रा जल में घोली जाए, तो विलयन का पीएच किस दिशा में जाएगा?

If a small amount of base is dissolved in water, in which direction will the pH of the solution move?

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Correct Answer

C. सात से अधिक की ओरTowards above 7

Step 1

Concept

Bases produce hydroxide ions in water.

Step 2

Why this answer is correct

A basic solution has pH greater than 7.

Step 3

Exam Tip

Remember the separate directions for acids and bases on the pH scale.

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