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Understanding the Basics: Difference Between Atoms and Molecules for Class 10
Understanding the Basics: Difference Between Atoms and Molecules for Class 10
Important Questions on Atoms and Molecules for Class 10 Exam Preparation

Created on August 11, 2025 By

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SCIENCE

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Carbon And Its Compounds CLASS 10 CBSE

Carbon And Its Compounds CLASS 10 CBSE WORKSHEET Carbon, a ubiquitous element in nature, plays a crucial role in organic chemistry and is fundamental to the existence of life as we know it. With the atomic number six, carbon is uniquely versatile, allowing it to bond with a variety of elements, leading to an extensive array of compounds.

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1 / 15

A. What type of bonds does a carbon atom form in methane?

A. Double bonds

B. Single covalent bonds

C. Ionic bonds

D. Triple bonds

Carbon forms four single covalent bonds with hydrogen in methane.

2 / 15

B. What is the freezing behaviour of diluted ethanoic acid (vinegar) during winter?

A. It freezes due to its higher freezing point than water

B. It evaporates quickly

C. It does not freeze

D. It melts quickly

Diluted ethanoic acid freezes in winter, pure ethanoic acid has a higher freezing point.

3 / 15

C. Which of the following undergoes addition reactions?

A. C2H6

B. C3H8

C. CH4

D. C2H4 (ethene)

Alkenes like C2H4 undergo addition reactions.

4 / 15

D. What is the major constituent of LPG?

A. Butane

B. Pentane

C. Propane

D. Ethene

Butane is the major constituent of LPG.

5 / 15

E. What is the isomeric pair among the following?

A. Ethane and propane

B. Ethane and ethane

C. Propane and butane

D. Butane and 2-methylpropane

Butane and 2-methylpropane are isomers.

6 / 15

F. Why are mineral acids stronger than carboxylic acids?

A. Carboxylic acids are completely ionised

B. Carboxylic acids are partially ionised

C. Mineral acids are partially ionised

D. Mineral acids are completely ionised

Mineral acids are completely ionised in solution which makes them stronger.

7 / 15

G. What is the product of the reaction: CH4 + Cl2 (in sunlight)?

A. CH3Cl + HCl

B. CH4 + H2SO4

C. CH3Cl + H2SO4

D. CHCl3 + HCl

Chlorine substitutes one hydrogen in methane in presence of sunlight.

8 / 15

H. What is the general formula of alkynes?

A. CnH2n

B. CnH2n+2

C. CnH2n-2

D. C2nH2n-2

Alkynes have the general formula CnH2n-2.

9 / 15

I. Which functional group combines with carbon to produce alcohol?

A. Aldehyde group (-CHO)

B. Carboxyl group (-COOH)

C. Hydroxyl group (-OH)

D. Ketone group (C=O)

Alcohol contains hydroxyl (-OH) group attached to carbon.

10 / 15

J. Which type of compound shows catenation property?

A. None of these

B. Metal compounds

C. Ionic compounds

D. Carbon compounds

Carbon compounds show catenation due to strong carbon-carbon bonds.

11 / 15

K. Name the hydrocarbon compound containing two carbon atoms.

A. Methane

B. Butane

C. Propane

D. Ethane

Two-carbon alkane is ethane.

12 / 15

L. The electronic configuration of an element is found to be 2, 4. How many bonds can one carbon atom form in a compound?

A. 2

B. 1

C. 6

D. 4

Carbon has 4 valence electrons, so it forms 4 covalent bonds to complete its octet.

13 / 15

M. Which of these functional groups is present in the compound with a carbon double bonded to oxygen?

A. Alcohol

B. Carboxylic acid

C. Ketone

D. Aldehyde

The compound with C=O and C-H is an aldehyde; C=O with no H is ketone.

14 / 15

N. What happens when ethanol is oxidized?

A. Ethanoic acid

B. Ethanol

C. Methanol

D. Acetaldehyde

Oxidation of ethanol produces ethanoic acid.

15 / 15

O. How does chlorine react with hydrocarbon in sunlight?

A. It breaks double and triple bonds into single bonds

B. It substitutes hydrogen atom from the compound

C. It adds an oxygen atom to the compound

D. It adds hydrogen to the compound

Chlorine substitutes hydrogen atom in hydrocarbon in sunlight.

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Created on August 09, 2025 By

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MATHS

Chapter 1. परिमेय संख्याएँ CLASS 8

परिमेय संख्याएँ: एक परिचय

कक्षा 8 के छात्रों के लिए परिमेय संख्याएँ की कार्यपत्रिका एक महत्वपूर्ण शिक्षण उपकरण है। यह छात्रों को संख्याओं की मूलभूत अवधारणाओं को समझने में मदद करती है। परिमेय संख्याएँ वे संख्याएँ हैं जिन्हें भिन्न या अंश के रूप में व्यक्त किया जा सकता है।

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1 / 12

Category: Maths

Tags: fraction, reciprocal

1) 2. What is the reciprocal of 7/9?

1) 9/7

2) 7/-9

3) 79

4) -1.2857142857143

Reciprocal is obtained by interchanging numerator and denominator.

2 / 12

Category: Maths

Tags: reciprocal

2) 4. What is the reciprocal of zero?

1) One

2) -1

3) Zero

4) Undefined

Reciprocal of zero is undefined.

3 / 12

Category: Maths

Tags: reciprocal

3) 14. What is the multiplicative inverse of -2?

1) -2

2) -0.5

3) 2-Jan

4) 2

The reciprocal is -1/2.

4 / 12

Category: Maths

Tags: negative fraction, reciprocal

4) 7. What is the reciprocal of -3/7?

1) -0.42857142857143

2) 3-Jul

3) -2.3333333333333

4) 7-Mar

Swap numerator and denominator, keep the sign.

5 / 12

Category: Maths

Tags: multiplicative identity

5) 9. What is the multiplicative identity in rational numbers?

1) 0

2) -1

3) 2

4) 1

Multiplying by 1 leaves the number unchanged.

6 / 12

Category: Maths

Tags: irrational, square root

6) 3. Which of the following is not a rational number?

1) 0

2) -3

3) 5-Apr

4) âˆš2

âˆš2 is irrational because its decimal expansion is non-terminating and non-repeating.

7 / 12

Category: Maths

Tags: integers, negative

7) 1. Is -5 a rational number?

1) Yes

2) Only positive numbers are rational

3) No

4) None of these

All integers are rational numbers because they can be written as p/q where q â‰ 0.

8 / 12

Category: Maths

Tags: fraction, simplification

8) 5. Simplify (-8/12).

1) -0.66666666666667

2) -1.5

3) -0.66666666666667

4) 3-Feb

-8/12 = -2/3 after dividing numerator and denominator by 4.

9 / 12

Category: Maths

Tags: closure property

9) 15. Rational numbers are closed under which operation(s)?

1) All given except division by 0

2) Addition and multiplication

3) Only addition

4) Only multiplication

Rational numbers are closed under addition, subtraction, multiplication, and division (except division by 0).

10 / 12

Category: Maths

Tags: multiplication

10) 6. What is the product of any two rational numbers?

1) Rational number

2) Integer

3) Zero

4) Irrational number

The product of two rational numbers is always rational.

11 / 12

Category: Maths

Tags: addition, opposite numbers

11) 10. (-5/8) + (5/8) = ?

1) 1

2) 8-Oct

3) 0

4) -1

Sum of opposite numbers is always zero.

12 / 12

Category: Maths

Tags: additive identity

12) 8. What is the additive identity in rational numbers?

1) 1

2) 2-Jan

3) -1

4) 0

Adding 0 to any number gives the same number.

Your score is

The average score is 13%

Metal and Non-Metal – Class 10 Science

Metal and Non-Metal – Class 10 Science: make up the bulk of the elements in the periodic table. Understanding their properties, uses, occurrence, and reactions is crucial for CBSE Class 10 and foundational for further studies in chemistry and materials science.

NamePhone NumberEmail

1 / 15

15. Which is the hardest natural substance?

Diamond

Iron

Quartz

Graphite

2 / 15

14. Which of these can displace hydrogen from acid?

Copper

Silver

Magnesium

Gold

3 / 15

13. Which non-metal is stored in water?

Phosphorus

Sulphur

Chlorine

Fluorine

4 / 15

12. Amphoteric oxides show

Basic character only

Acidic character only

Both acidic and basic character

No reaction with acids and bases

5 / 15

11. Which metal does not corrode easily?

Iron

Silver

Aluminium

Gold

6 / 15

10. Which metal is used for galvanisation?

Zinc

Copper

Tin

Nickel

7 / 15

9. Which is the most abundant metal in Earthâ€™s crust?

Aluminium

Iron

Copper

Sodium

8 / 15

8. Which non-metal is essential for respiration?

Nitrogen

Oxygen

Carbon

Sulphur

9 / 15

7. Which of the following is malleable?

Sulphur

Phosphorus

Copper

Carbon

10 / 15

6. Which gas is released when metals react with dilute acids?

Oxygen

Hydrogen

Nitrogen

Carbon dioxide

11 / 15

5. Which of these reacts with water to form an alkali?

Copper

Sodium

Iron

Gold

12 / 15

4. Which metal is liquid at room temperature?

Mercury

Aluminium

Zinc

Lead

13 / 15

3. Which non-metal is a good conductor of electricity?

Oxygen

Sulphur

Graphite

Phosphorus

14 / 15

2. Which property is common to most metals?

Brittle

Good conductor of electricity

Dull surface

Poor conductor of heat

15 / 15

1. Which of the following is a highly reactive metal?

Gold

Sodium

Copper

Silver

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परिमेय संख्याएँ: एक परिचय