Class 10 class10 MCQ Questions

Question 571/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

कृषि में मिट्टी का पीएच परीक्षण क्यों उपयोगी है?

Why is soil pH testing useful in agriculture?

Explanation opens after your attempt

Correct Answer

A. यह मिट्टी की अम्लीयता या क्षारीयता जानने में मदद करता हैIt helps know the acidity or basicity of soil

Step 1

Concept

Plants need soil with a suitable pH.

Step 2

Why this answer is correct

pH testing shows whether soil is acidic or basic.

Step 3

Exam Tip

Based on this, lime or organic matter can be added.

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Question 572/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

यदि मिट्टी का पीएच बहुत कम है, तो पौधों की वृद्धि पर क्या प्रभाव पड़ सकता है?

If the pH of soil is very low, what effect can it have on plant growth?

Explanation opens after your attempt

Correct Answer

A. पौधों की वृद्धि प्रभावित हो सकती हैPlant growth may be affected

Step 1

Concept

Very low pH indicates high acidity of soil.

Step 2

Why this answer is correct

Highly acidic soil can affect nutrient absorption.

Step 3

Exam Tip

Such soil can be improved by adding lime.

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Question 573/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

चींटी के डंक में उपस्थित अम्ल को शांत करने के लिए बेकिंग सोडा उपयोगी क्यों है?

Why is baking soda useful for reducing the effect of acid present in an ant sting?

Explanation opens after your attempt

Correct Answer

B. क्योंकि यह हल्का क्षारीय होता हैBecause it is mildly basic

Step 1

Concept

An ant sting contains an acidic substance.

Step 2

Why this answer is correct

Baking soda is mildly basic.

Step 3

Exam Tip

It can neutralise the acid and reduce irritation.

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Question 574/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

पेट में अम्लता बढ़ने पर अम्लरोधी औषधि लेने से राहत क्यों मिलती है?

Why does taking an antacid give relief when acidity increases in the stomach?

Explanation opens after your attempt

Correct Answer

A. अम्लरोधी अतिरिक्त अम्ल को निष्क्रिय करता हैAntacid neutralises excess acid

Step 1

Concept

Excess acid in the stomach can cause burning and indigestion.

Step 2

Why this answer is correct

An antacid is mildly basic.

Step 3

Exam Tip

It neutralises excess acid and gives relief.

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Question 575/2107 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?

Explanation opens after your attempt

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 576/2107 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 577/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

अम्ल वर्षा संगमरमर की इमारतों को नुकसान कैसे पहुँचा सकती है?

How can acid rain damage marble buildings?

Explanation opens after your attempt

Correct Answer

A. अम्ल संगमरमर के कैल्शियम कार्बोनेट से अभिक्रिया कर सकता हैAcid can react with calcium carbonate in marble

Step 1

Concept

Marble contains calcium carbonate.

Step 2

Why this answer is correct

Acids can react with carbonates.

Step 3

Exam Tip

Therefore, acid rain can slowly damage marble surfaces.

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Question 578/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

विरंजक चूर्ण को सूखे और बंद पात्र में रखना क्यों उचित है?

Why is it proper to store bleaching powder in a dry and closed container?

Explanation opens after your attempt

Correct Answer

A. ताकि इसकी उपयोगी क्लोरीन संबंधी क्षमता बनी रहेTo preserve its useful chlorine-related activity

Step 1

Concept

The usefulness of bleaching powder is related to its available chlorine activity.

Step 2

Why this answer is correct

Moisture and air can reduce its quality.

Step 3

Exam Tip

Therefore, it should be stored in a dry and closed container.

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Question 579/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

विरंजक चूर्ण बनाने की सही विधि कौन सी है?

Which is the correct method of preparing bleaching powder?

Explanation opens after your attempt

Correct Answer

A. सूखे बुझा चूने पर क्लोरीन प्रवाहित करनाPassing chlorine over dry slaked lime

Step 1

Concept

Bleaching powder is a chlorine-related substance.

Step 2

Why this answer is correct

It is prepared by passing chlorine over dry slaked lime.

Step 3

Exam Tip

Its preparation and uses are both important for exams.

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Question 580/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

क्लोर क्षार प्रक्रिया में विलयन में बचा क्षार किस उद्योग में उपयोगी है?

The alkali left in solution during the chlor-alkali process is useful in which industry?

Explanation opens after your attempt

Correct Answer

A. साबुन बनाने मेंSoap making

Step 1

Concept

Sodium hydroxide is obtained in the chlor-alkali process.

Step 2

Why this answer is correct

Sodium hydroxide is useful in soap and paper industries.

Step 3

Exam Tip

It is an important alkali obtained from common salt.

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Question 581/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

क्लोर क्षार प्रक्रिया में ऋणाग्र के पास बनने वाली गैस का उपयोग किसमें किया जा सकता है?

The gas formed near the cathode in the chlor-alkali process can be used in which process?

Explanation opens after your attempt

Correct Answer

B. वनस्पति तेलों के हाइड्रोजनीकरण मेंHydrogenation of vegetable oils

Step 1

Concept

Hydrogen is formed at the cathode in the chlor-alkali process.

Step 2

Why this answer is correct

Hydrogen is used in the hydrogenation of vegetable oils.

Step 3

Exam Tip

Remember the separate uses of each product of the process.

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Question 582/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

क्लोर क्षार प्रक्रिया में धनाग्र के पास उत्पन्न गैस का उपयोग किस कार्य में हो सकता है?

The gas produced near the anode in the chlor-alkali process can be used for which purpose?

Explanation opens after your attempt

Correct Answer

A. जल को कीटाणुरहित करने मेंDisinfecting water

Step 1

Concept

In the chlor-alkali process, chlorine is formed at the anode.

Step 2

Why this answer is correct

Chlorine has disinfecting properties.

Step 3

Exam Tip

Therefore, it can be used in water treatment.

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Question 583/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

क्लोर क्षार प्रक्रिया में सोडियम क्लोराइड के जलीय विलयन का उपयोग क्यों किया जाता है?

Why is an aqueous solution of sodium chloride used in the chlor-alkali process?

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Correct Answer

A. इससे क्लोरीन, हाइड्रोजन और सोडियम हाइड्रॉक्साइड प्राप्त होते हैंIt gives chlorine, hydrogen and sodium hydroxide

Step 1

Concept

Aqueous sodium chloride solution is called brine.

Step 2

Why this answer is correct

Its electrolysis gives chlorine, hydrogen and sodium hydroxide.

Step 3

Exam Tip

All these are useful industrial substances.

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Question 584/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

कठोर जल में साबुन कम झाग देता है। वाशिंग सोडा मिलाने पर झाग बनने में सुधार क्यों होता है?

Soap produces less lather in hard water. Why does adding washing soda improve lather formation?

Explanation opens after your attempt

Correct Answer

A. यह कैल्शियम और मैग्नीशियम आयनों को हटाने में मदद करता हैIt helps remove calcium and magnesium ions

Step 1

Concept

Hard water contains calcium and magnesium salts.

Step 2

Why this answer is correct

Washing soda helps remove these ions.

Step 3

Exam Tip

Soap gives better lather in softened water.

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Question 585/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

बेकिंग पाउडर में अम्ल और बेकिंग सोडा साथ होने से केक फूला हुआ क्यों बनता है?

Why does the presence of acid and baking soda together in baking powder make cake fluffy?

Explanation opens after your attempt

Correct Answer

C. क्योंकि कार्बन डाइऑक्साइड गैस निकलती हैBecause carbon dioxide gas is released

Step 1

Concept

Baking powder contains baking soda and a mild edible acid.

Step 2

Why this answer is correct

On heating, carbon dioxide is released.

Step 3

Exam Tip

Gas bubbles make the cake light and fluffy.

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Question 586/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

बेकिंग सोडा को गर्म करने पर बने सोडियम कार्बोनेट के कारण स्वाद कड़वा क्यों हो सकता है?

Why can the sodium carbonate formed on heating baking soda cause a bitter taste?

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Correct Answer

A. क्योंकि सोडियम कार्बोनेट क्षारीय प्रकृति का होता हैBecause sodium carbonate is basic in nature

Step 1

Concept

Baking soda can form sodium carbonate on heating.

Step 2

Why this answer is correct

Sodium carbonate is basic in nature.

Step 3

Exam Tip

Basic substances can give a bitter taste, so baking powder is more suitable.

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Question 587/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

प्लास्टर ऑफ पेरिस का उपयोग मूर्तियाँ और साँचे बनाने में किस गुण के कारण होता है?

Due to which property is plaster of Paris used for making statues and moulds?

Explanation opens after your attempt

Correct Answer

A. जल मिलाने पर जल्दी जमनाSetting quickly on adding water

Step 1

Concept

Plaster of Paris sets when water is added.

Step 2

Why this answer is correct

It can form a hard shape.

Step 3

Exam Tip

This is why it is used for statues, moulds and casts.

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Question 588/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

जिप्सम को अधिक गरम करने पर प्लास्टर ऑफ पेरिस बनाने की उपयोगिता क्यों घट सकती है?

Why can overheating gypsum reduce its usefulness for preparing plaster of Paris?

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Correct Answer

C. क्योंकि क्रिस्टलीय जल का नियंत्रण बिगड़ सकता हैBecause control over water of crystallisation can be disturbed

Step 1

Concept

Plaster of Paris is prepared by heating gypsum at a controlled temperature.

Step 2

Why this answer is correct

Overheating can change the water content and properties.

Step 3

Exam Tip

Therefore, temperature control is necessary in its preparation.

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Question 589/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

वाशिंग सोडा को जलयुक्त लवण क्यों कहा जा सकता है?

Why can washing soda be called a hydrated salt?

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Correct Answer

A. क्योंकि इसमें क्रिस्टलीय जल होता हैBecause it contains water of crystallisation

Step 1

Concept

Washing soda is sodium carbonate decahydrate.

Step 2

Why this answer is correct

Decahydrate means it contains ten molecules of water of crystallisation.

Step 3

Exam Tip

Such salts are called hydrated salts.

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Question 590/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस पदार्थ में क्रिस्टलीय जल की उपस्थिति रंग परिवर्तन से आसानी से दिखाई देती है?

In which substance is the presence of water of crystallisation easily shown by colour change?

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Correct Answer

B. नीला कॉपर सल्फेटBlue copper sulphate

Step 1

Concept

Blue copper sulphate contains water of crystallisation.

Step 2

Why this answer is correct

On heating, water is lost and it becomes white.

Step 3

Exam Tip

On adding water, the blue colour returns.

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Question 591/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

एक विलयन में मिथाइल ऑरेंज लाल हो जाता है और नीला लिटमस लाल हो जाता है। विलयन की प्रकृति क्या होगी?

In a solution, methyl orange turns red and blue litmus turns red. What is the nature of the solution?

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Correct Answer

A. अम्लीयAcidic

Step 1

Concept

Methyl orange turns red in an acidic solution.

Step 2

Why this answer is correct

Acids turn blue litmus red.

Step 3

Exam Tip

Both observations confirm acidic nature.

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Question 592/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

एक विलयन में मिथाइल ऑरेंज पीला और फिनॉल्फ्थेलीन गुलाबी हो जाती है। विलयन कैसा है?

In a solution, methyl orange becomes yellow and phenolphthalein becomes pink. What is the nature of the solution?

Explanation opens after your attempt

Correct Answer

C. क्षारीयBasic

Step 1

Concept

Methyl orange is yellow in a basic solution.

Step 2

Why this answer is correct

Phenolphthalein is pink in a basic solution.

Step 3

Exam Tip

Both observations show that the solution is basic.

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Question 593/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस प्रयोग में अम्लीय गुण दिखाने के लिए जल की आवश्यकता सिद्ध होती है?

Which experiment proves that water is needed to show acidic properties?

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Correct Answer

A. सूखे हाइड्रोजन क्लोराइड का सूखे लिटमस पर प्रभाव न होनाDry hydrogen chloride having no effect on dry litmus

Step 1

Concept

Dry hydrogen chloride does not show acidic effect on dry litmus.

Step 2

Why this answer is correct

In the presence of water, ions form and acidic behaviour appears.

Step 3

Exam Tip

This proves that aqueous condition is important for acidic behaviour.

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Question 594/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

सल्फर डाइऑक्साइड जल में घुलकर अम्लीय विलयन बना सकती है। इससे सल्फर डाइऑक्साइड किस प्रकार का ऑक्साइड सिद्ध होता है?

Sulphur dioxide can dissolve in water to form an acidic solution. What type of oxide does this prove sulphur dioxide to be?

Explanation opens after your attempt

Correct Answer

C. अम्लीय ऑक्साइडAcidic oxide

Step 1

Concept

Non-metal oxides can form acidic solutions in water.

Step 2

Why this answer is correct

Sulphur dioxide is a non-metal oxide.

Step 3

Exam Tip

Forming an acidic solution proves it is an acidic oxide.

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Question 595/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

मैग्नीशियम ऑक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया से क्या बनेगा?

What is formed when magnesium oxide reacts with hydrochloric acid?

Explanation opens after your attempt

Correct Answer

A. मैग्नीशियम क्लोराइड और जलMagnesium chloride and water

Step 1

Concept

Magnesium oxide is a metal oxide and shows basic nature.

Step 2

Why this answer is correct

Metal oxides react with acids to form salt and water.

Step 3

Exam Tip

Here the salt is magnesium chloride.

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Question 596/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

पोटैशियम हाइड्रॉक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया में कौन सा लवण बनेगा?

Which salt is formed in the reaction between potassium hydroxide and hydrochloric acid?

Explanation opens after your attempt

Correct Answer

C. पोटैशियम क्लोराइडPotassium chloride

Step 1

Concept

Potassium hydroxide provides potassium ions.

Step 2

Why this answer is correct

Hydrochloric acid provides chloride ions.

Step 3

Exam Tip

They combine to form potassium chloride.

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Question 597/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

सोडियम हाइड्रॉक्साइड और नाइट्रिक अम्ल की अभिक्रिया से बनने वाला लवण कौन सा होगा?

Which salt is formed when sodium hydroxide reacts with nitric acid?

Explanation opens after your attempt

Correct Answer

B. सोडियम नाइट्रेटSodium nitrate

Step 1

Concept

Nitric acid forms nitrate salts.

Step 2

Why this answer is correct

Sodium hydroxide provides sodium ions.

Step 3

Exam Tip

Therefore, sodium nitrate is formed.

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Question 598/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस जोड़ी से बनने वाला लवण सामान्यतः उदासीन विलयन दे सकता है?

Which pair can generally form a salt that gives a neutral solution?

Explanation opens after your attempt

Correct Answer

C. प्रबल अम्ल और प्रबल क्षारStrong acid and strong base

Step 1

Concept

Salts of strong acids and strong bases are generally neutral.

Step 2

Why this answer is correct

Sodium chloride is such a salt.

Step 3

Exam Tip

Its aqueous solution has pH close to 7.

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Question 599/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस स्थिति में किसी लवण का विलयन अम्लीय हो सकता है?

In which condition can a salt solution be acidic?

Explanation opens after your attempt

Correct Answer

A. प्रबल अम्ल और कमजोर क्षार से बने लवण मेंIn a salt made from a strong acid and a weak base

Step 1

Concept

A salt made from a strong acid and a weak base can give an acidic solution.

Step 2

Why this answer is correct

Ammonium chloride is a common example.

Step 3

Exam Tip

Understand salt pH through its parent substances.

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Question 600/2107 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किस स्थिति में किसी लवण का विलयन क्षारीय हो सकता है?

In which condition can a salt solution be basic?

Explanation opens after your attempt

Correct Answer

B. जब लवण कमजोर अम्ल और प्रबल क्षार से बनेWhen the salt is made from a weak acid and a strong base

Step 1

Concept

The nature of a salt depends on its parent acid and base.

Step 2

Why this answer is correct

A salt of a weak acid and a strong base can be basic.

Step 3

Exam Tip

Sodium carbonate is an example.

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class10 MCQ Questions for Class 10

Practice Questions

कृषि में मिट्टी का पीएच परीक्षण क्यों उपयोगी है?

Concept

Why this answer is correct

Exam Tip

यदि मिट्टी का पीएच बहुत कम है, तो पौधों की वृद्धि पर क्या प्रभाव पड़ सकता है?

Concept

Why this answer is correct

Exam Tip

चींटी के डंक में उपस्थित अम्ल को शांत करने के लिए बेकिंग सोडा उपयोगी क्यों है?

Concept

Why this answer is correct

Exam Tip

पेट में अम्लता बढ़ने पर अम्लरोधी औषधि लेने से राहत क्यों मिलती है?

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

अम्ल वर्षा संगमरमर की इमारतों को नुकसान कैसे पहुँचा सकती है?

Concept

Why this answer is correct

Exam Tip

विरंजक चूर्ण को सूखे और बंद पात्र में रखना क्यों उचित है?

Concept

Why this answer is correct

Exam Tip

विरंजक चूर्ण बनाने की सही विधि कौन सी है?

Concept

Why this answer is correct

Exam Tip

क्लोर क्षार प्रक्रिया में विलयन में बचा क्षार किस उद्योग में उपयोगी है?

Concept

Why this answer is correct

Exam Tip

क्लोर क्षार प्रक्रिया में ऋणाग्र के पास बनने वाली गैस का उपयोग किसमें किया जा सकता है?

Concept

Why this answer is correct

Exam Tip

क्लोर क्षार प्रक्रिया में धनाग्र के पास उत्पन्न गैस का उपयोग किस कार्य में हो सकता है?

Concept

Why this answer is correct

Exam Tip

क्लोर क्षार प्रक्रिया में सोडियम क्लोराइड के जलीय विलयन का उपयोग क्यों किया जाता है?

Concept

Why this answer is correct

Exam Tip

कठोर जल में साबुन कम झाग देता है। वाशिंग सोडा मिलाने पर झाग बनने में सुधार क्यों होता है?

Concept

Why this answer is correct

Exam Tip

बेकिंग पाउडर में अम्ल और बेकिंग सोडा साथ होने से केक फूला हुआ क्यों बनता है?

Concept

Why this answer is correct

Exam Tip

बेकिंग सोडा को गर्म करने पर बने सोडियम कार्बोनेट के कारण स्वाद कड़वा क्यों हो सकता है?

Concept

Why this answer is correct

Exam Tip

प्लास्टर ऑफ पेरिस का उपयोग मूर्तियाँ और साँचे बनाने में किस गुण के कारण होता है?

Concept

Why this answer is correct

Exam Tip

जिप्सम को अधिक गरम करने पर प्लास्टर ऑफ पेरिस बनाने की उपयोगिता क्यों घट सकती है?

Concept

Why this answer is correct

Exam Tip

वाशिंग सोडा को जलयुक्त लवण क्यों कहा जा सकता है?

Concept

Why this answer is correct

Exam Tip

किस पदार्थ में क्रिस्टलीय जल की उपस्थिति रंग परिवर्तन से आसानी से दिखाई देती है?

Concept