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Concept-wise Practice

pH MCQ Questions for Class 10

pH se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

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Practice Questions

278 questions tagged with pH.

Question 211/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 11

यदि दो अम्लीय विलयनों के पीएच मान क्रमशः दो और चार हैं, तो हाइड्रोजन आयनों की मात्रा किसमें अधिक होगी?

If two acidic solutions have pH values 2 and 4 respectively, which one has a higher concentration of hydrogen ions?

Explanation opens after your attempt
Correct Answer

A. पीएच दो वाला विलयनSolution with pH 2

Step 1

Concept

Lower pH means higher acidity.

Step 2

Why this answer is correct

A more acidic solution has more hydrogen ions.

Step 3

Exam Tip

Therefore, the solution with pH 2 has higher hydrogen ion concentration.

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Question 212/278 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?

Explanation opens after your attempt
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 213/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

दाँतों में क्षय शुरू होने के लिए कौन सी स्थिति अधिक अनुकूल है?

Which condition is more favourable for the beginning of tooth decay?

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Correct Answer

B. मुँह का पीएच पाँच दशमलव पाँच से कम होMouth pH is below 5.5

Step 1

Concept

Tooth enamel is affected by acids.

Step 2

Why this answer is correct

When pH falls below 5.5, the chance of decay increases.

Step 3

Exam Tip

Mildly basic toothpaste helps reduce acidity.

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Question 214/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

दाँतों की परत को नुकसान से बचाने के लिए भोजन के बाद कुल्ला करना क्यों लाभकारी है?

Why is rinsing the mouth after meals helpful in protecting tooth enamel?

Explanation opens after your attempt
Correct Answer

A. यह मुँह में बने अम्लों को कम करने में सहायता करता हैIt helps reduce acids formed in the mouth

Step 1

Concept

Bacteria can form acids after meals.

Step 2

Why this answer is correct

These acids can harm tooth enamel.

Step 3

Exam Tip

Rinsing helps reduce the acidic effect.

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Question 215/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

निम्न में से कौन सा कथन क्षार के लिए सही है?

Which of the following statements is correct for a base?

Explanation opens after your attempt
Correct Answer

C. यह जल में हाइड्रॉक्साइड आयन दे सकता हैIt can give hydroxide ions in water

Step 1

Concept

Bases give hydroxide ions in water.

Step 2

Why this answer is correct

These ions make the solution basic in nature.

Step 3

Exam Tip

A basic solution generally has pH greater than 7.

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Question 216/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

यदि अम्लीय विलयन में क्षार धीरे-धीरे मिलाया जाए, तो सार्वत्रिक सूचक का रंग किस दिशा में बदल सकता है?

If a base is slowly added to an acidic solution, in which direction can the colour of universal indicator change?

Explanation opens after your attempt
Correct Answer

A. अधिक अम्लीय रंगों से उदासीन रंग की ओरFrom more acidic colours towards neutral colour

Step 1

Concept

Adding a base reduces acidity.

Step 2

Why this answer is correct

The pH moves towards 7.

Step 3

Exam Tip

Therefore, the indicator colour can move from acidic colours towards a neutral colour.

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Question 217/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किसी विलयन में सार्वत्रिक सूचक डालने पर रंग हरा दिखाई देता है। विलयन की प्रकृति क्या होगी?

When universal indicator is added to a solution, the colour appears green. What is the nature of the solution?

Explanation opens after your attempt
Correct Answer

B. उदासीनNeutral

Step 1

Concept

Universal indicator gives different colours at different pH values.

Step 2

Why this answer is correct

Green usually indicates a neutral solution.

Step 3

Exam Tip

A neutral solution has pH close to 7.

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Question 218/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

एक विलयन का पीएच मान दो है और दूसरे का पीएच मान पाँच है। दोनों अम्लीय हैं। अधिक संक्षारक होने की संभावना किसमें अधिक होगी?

One solution has pH 2 and another has pH 5. Both are acidic. Which one is more likely to be more corrosive?

Explanation opens after your attempt
Correct Answer

A. पीएच दो वाला विलयनSolution with pH 2

Step 1

Concept

Lower pH shows greater acidity.

Step 2

Why this answer is correct

pH 2 is more acidic than pH 5.

Step 3

Exam Tip

A more acidic solution can be more corrosive, so it must be handled carefully.

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Question 219/278 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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Question 220/278 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?

Explanation opens after your attempt
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 221/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

यदि अम्लीय विलयन में हाइड्रोजन आयनों की मात्रा दस गुना बढ़ जाए, तो पीएच पर सामान्य प्रभाव क्या होगा?

If the concentration of hydrogen ions in an acidic solution increases ten times, what is the general effect on pH?

Explanation opens after your attempt
Correct Answer

A. पीएच लगभग एक इकाई घटता हैpH decreases by about one unit

Step 1

Concept

pH is inversely related to hydrogen ion concentration.

Step 2

Why this answer is correct

More hydrogen ions mean greater acidity and lower pH.

Step 3

Exam Tip

A tenfold increase generally lowers pH by about one unit.

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Question 222/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किस स्थिति में नदी या झील के जीवों को अम्लीय वर्षा से अधिक खतरा होगा?

In which condition will aquatic organisms in a river or lake be at greater risk from acid rain?

Explanation opens after your attempt
Correct Answer

A. जब जल का पीएच बहुत कम हो जाएWhen the pH of water becomes very low

Step 1

Concept

Aquatic organisms survive well only within a suitable pH range.

Step 2

Why this answer is correct

Acid rain can lower the pH of water bodies.

Step 3

Exam Tip

Very low pH can be harmful to aquatic life.

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Question 223/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

चार विलयनों के पीएच मान पाँच, सात, नौ और ग्यारह हैं। इनमें दाँतों के लिए सबसे कम हानिकारक अम्लीय विलयन कौन सा है?

Four solutions have pH values 5, 7, 9 and 11. Which acidic solution among them is least harmful to teeth?

Explanation opens after your attempt
Correct Answer

A. पीएच पाँच वाला विलयनSolution with pH 5

Step 1

Concept

Among the given values, only pH 5 is acidic.

Step 2

Why this answer is correct

Tooth enamel can be affected when pH falls below about 5.5.

Step 3

Exam Tip

Among acidic substances, lower pH means greater chance of damage.

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Question 224/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किसी क्षारीय विलयन का पीएच मान बारह है। उसमें जल मिलाने पर पीएच मान में क्या परिवर्तन होगा?

A basic solution has pH 12. What happens to its pH when water is added?

Explanation opens after your attempt
Correct Answer

B. पीएच सात के पास घटेगाpH will decrease towards 7

Step 1

Concept

A solution with pH 12 is basic.

Step 2

Why this answer is correct

Adding water dilutes the base and decreases its basicity.

Step 3

Exam Tip

On dilution, the pH of a basic solution moves towards 7.

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Question 225/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 9

किसी विलयन का पीएच मान चार है। उसी विलयन में जल मिलाने पर पीएच मान किस दिशा में बदलने की संभावना है?

A solution has pH 4. When water is added to the same solution, in which direction is its pH likely to change?

Explanation opens after your attempt
Correct Answer

A. सात के पासTowards 7

Step 1

Concept

A solution with pH 4 is acidic.

Step 2

Why this answer is correct

Adding water dilutes the acid and decreases its acidity.

Step 3

Exam Tip

On dilution, the pH of an acidic solution moves towards 7 but usually does not become greater than 7.

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Question 226/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

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?

Explanation opens after your attempt
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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Question 227/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

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?

Explanation opens after your attempt
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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Question 228/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

दाँतों की सुरक्षा के लिए मंजन सामान्यतः हल्का क्षारीय क्यों बनाया जाता है?

Why is toothpaste generally made mildly basic for tooth protection?

Explanation opens after your attempt
Correct Answer

A. ताकि मुँह में बने अम्ल को निष्क्रिय कर सकेTo neutralise acid formed in the mouth

Step 1

Concept

Bacteria can produce acids after eating.

Step 2

Why this answer is correct

These acids can damage tooth enamel.

Step 3

Exam Tip

Mildly basic toothpaste neutralises the acid and helps protect teeth.

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Question 229/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

टमाटर के रस, साबुन के विलयन, शुद्ध जल और बेकिंग सोडा विलयन में उदासीन पदार्थ कौन सा होगा?

Among tomato juice, soap solution, pure water and baking soda solution, which substance will be neutral?

Explanation opens after your attempt
Correct Answer

B. शुद्ध जलPure water

Step 1

Concept

A neutral substance has a pH of about 7.

Step 2

Why this answer is correct

Pure water is generally considered neutral.

Step 3

Exam Tip

Tomato juice is acidic, while soap and baking soda solutions are basic.

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Question 230/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 8

दूध के खट्टा होने पर उसका पीएच मान किस दिशा में बदलता है?

When milk turns sour, in which direction does its pH change?

Explanation opens after your attempt
Correct Answer

A. पीएच घटता हैpH decreases

Step 1

Concept

When milk turns sour, acidic substances increase.

Step 2

Why this answer is correct

More acidity lowers the pH value.

Step 3

Exam Tip

Connect sour taste with acidic nature for exams.

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Question 231/278 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 232/278 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?

Explanation opens after your attempt
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 233/278 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 234/278 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 235/278 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 236/278 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 237/278 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 238/278 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 239/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 6

यदि किसी अज्ञात विलयन ने लाल लिटमस को नीला किया और उसका पीएच ग्यारह निकला तो सबसे सही निष्कर्ष क्या है?

If an unknown solution turns red litmus blue and has pH eleven what is the most correct conclusion?

Explanation opens after your attempt
Correct Answer

A. विलयन क्षारीय हैThe solution is basic

Step 1

Concept

लाल लिटमस का नीला होना क्षार का संकेत है। / Red litmus turning blue indicates a base.

Step 2

Why this answer is correct

पीएच ग्यारह सात से अधिक है। / pH eleven is greater than seven.

Step 3

Exam Tip

दोनों संकेत बताते हैं कि विलयन क्षारीय है। / Both signs show that the solution is basic.

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Question 240/278 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 6

अम्ल वर्षा को सामान्य वर्षा से अधिक हानिकारक क्यों माना जाता है?

Why is acid rain considered more harmful than normal rain?

Explanation opens after your attempt
Correct Answer

A. इसका पीएच बहुत कम होता हैIts pH is very low

Step 1

Concept

अम्ल वर्षा का पीएच सामान्य से कम होता है। / Acid rain has lower pH than normal rain.

Step 2

Why this answer is correct

कम पीएच अधिक अम्लीयता बताता है। / Lower pH shows greater acidity.

Step 3

Exam Tip

अधिक अम्लीय वर्षा इमारतों और जीवों को नुकसान पहुंचा सकती है। / More acidic rain can harm buildings and living beings.

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