How many questions are in this quiz?

This level is designed for 50 active questions. Currently 50 questions are available for the selected class and difficulty.

Is there a timer in this quiz?

Yes, the timer uses 35 seconds per question for Medium difficulty and shows the total remaining time on the page.

Can I open each question separately?

Yes, every question has its own SEO-friendly page with answer, explanation and related practice links.

Science Quiz - Class 10 Science Chemical Substances

Question 1/50 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.

Open Question Page

Question 2/50 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.

Open Question Page

Question 3/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

किसी अज्ञात विलयन में जस्ता डालने पर गैस निकलती है और वह गैस जलती तिल्ली के पास चटाक ध्वनि देती है। विलयन की प्रकृति क्या हो सकती है?

When zinc is added to an unknown solution, a gas is released and it gives a pop sound near a burning splint. What could be the nature of the solution?

Explanation opens after your attempt

Correct Answer

B. अम्लीय विलयनAcidic solution

Step 1

Concept

Reactive metals like zinc react with acids.

Step 2

Why this answer is correct

This reaction produces hydrogen gas.

Step 3

Exam Tip

Hydrogen gives a pop sound near a burning splint.

Open Question Page

Question 4/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

एक छात्र ने सोडियम कार्बोनेट में अम्ल मिलाया। गैस निकली और चूने का पानी दूधिया हो गया। गैस कौन सी थी?

A student added acid to sodium carbonate. A gas was released and lime water turned milky. Which gas was it?

Explanation opens after your attempt

Correct Answer

D. कार्बन डाइऑक्साइडCarbon dioxide

Step 1

Concept

Acids react with carbonates to produce carbon dioxide.

Step 2

Why this answer is correct

Carbon dioxide turns lime water milky.

Step 3

Exam Tip

This is an important test for gas identification.

Open Question Page

Question 5/50 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.

Open Question Page

Question 6/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

जल में घुलने पर कौन सा पदार्थ अम्लीय गुण दिखाने के लिए हाइड्रोजन आयन उपलब्ध कराता है?

Which substance provides hydrogen ions to show acidic properties when dissolved in water?

Explanation opens after your attempt

Correct Answer

B. हाइड्रोजन क्लोराइडHydrogen chloride

Step 1

Concept

Acids give hydrogen ions in water.

Step 2

Why this answer is correct

Hydrogen chloride dissolves in water to form hydrochloric acid.

Step 3

Exam Tip

Ion formation in water is necessary for acidic behaviour.

Open Question Page

Question 7/50 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.

Open Question Page

Question 8/50 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.

Open Question Page

Question 9/50 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.

Open Question Page

Question 10/50 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.

Open Question Page

Question 11/50 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.

Open Question Page

Question 12/50 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.

Open Question Page

Question 13/50 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.

Open Question Page

Question 14/50 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.

Open Question Page

Question 15/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 16/50 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.

Open Question Page

Question 17/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 18/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 19/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 20/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 21/50 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.

Open Question Page

Question 22/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 23/50 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.

Open Question Page

Question 24/50 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.

Open Question Page

Question 25/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 26/50 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.

Open Question Page

Question 27/50 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.

Open Question Page

Question 28/50 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.

Open Question Page

Question 29/50 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.

Open Question Page

Question 30/50 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.

Open Question Page

Question 31/50 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.

Open Question Page

Question 32/50 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.

Open Question Page

Question 33/50 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.

Open Question Page

Question 34/50 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.

Open Question Page

Question 35/50 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.

Open Question Page

Question 36/50 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.

Open Question Page

Question 37/50 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.

Open Question Page

Question 38/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

कौन सा पदार्थ प्राकृतिक सूचक के रूप में क्षारीय विलयन की पहचान कर सकता है?

Which substance can identify a basic solution as a natural indicator?

Explanation opens after your attempt

Correct Answer

A. हल्दीTurmeric

Step 1

Concept

Turmeric is a natural indicator.

Step 2

Why this answer is correct

In a basic medium, turmeric becomes reddish brown.

Step 3

Exam Tip

This is why turmeric stain changes colour with soap.

Open Question Page

Question 39/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

गुड़हल के फूल का अर्क अम्ल और क्षार की पहचान में कैसे सहायक हो सकता है?

How can hibiscus flower extract help in identifying acids and bases?

Explanation opens after your attempt

Correct Answer

A. यह अलग माध्यम में रंग परिवर्तन दिखा सकता हैIt can show colour change in different media

Step 1

Concept

Extracts of some flowers act as natural indicators.

Step 2

Why this answer is correct

Hibiscus extract can show different colours in acidic and basic media.

Step 3

Exam Tip

Examples of natural indicators are often asked in exams.

Open Question Page

Question 40/50 Medium Science Chemical Substances – Nature and Behaviour Acids, Bases, and Salts Class 10 Level 10

प्याज का रस घ्राण सूचक के रूप में क्षार की पहचान कैसे कर सकता है?

How can onion juice identify a base as an olfactory indicator?

Explanation opens after your attempt

Correct Answer

A. क्षार में इसकी गंध बदल या कम हो सकती हैIts smell can change or decrease in a base

Step 1

Concept

Olfactory indicators give clues through change in smell.

Step 2

Why this answer is correct

Onion smell can change in a basic medium.

Step 3

Exam Tip

Therefore, onion juice is an example of an olfactory indicator.

Open Question Page

Question 41/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 42/50 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.

Open Question Page

Question 43/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 44/50 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.

Open Question Page

Question 45/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 46/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 47/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 48/50 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?

Explanation opens after your attempt

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.

Open Question Page

Question 49/50 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.

Open Question Page

Question 50/50 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.

Open Question Page

Class 10 Science - Chemical Substances – Nature and Behaviour - Acids, Bases, and Salts Medium Quiz

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

Concept

Why this answer is correct

Exam Tip

एक छात्र ने सोडियम कार्बोनेट में अम्ल मिलाया। गैस निकली और चूने का पानी दूधिया हो गया। गैस कौन सी थी?

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

जल में घुलने पर कौन सा पदार्थ अम्लीय गुण दिखाने के लिए हाइड्रोजन आयन उपलब्ध कराता है?

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

मैग्नीशियम ऑक्साइड और हाइड्रोक्लोरिक अम्ल की अभिक्रिया से क्या बनेगा?

Concept

Why this answer is correct

Exam Tip

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

Concept

Why this answer is correct

Exam Tip

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

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