CBSE Class X – Science Chemistry Exam (Full Syllabus)

This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Chemistry

Each time random 25 questions will be displaced from the question bank of 500 + Questions
So we recommend you to retake the quiz till you have mastered all the questions

1 / 25

Identify the reducing agent in the following reactions: Fe₂O₃ + 3CO → 2Fe + 3CO₂

CO

Fe

CO₂

Fe₂O

2 / 25

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Name the type of reaction taking place.

double displacement reaction

single displacement reaction

double replacement reaction

all of these

3 / 25

Solid calcium oxide reacts vigorously with water to form calcium hydroxide, accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form a solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

It is an endothermic reaction

It is an exothermic reaction.

The pH of the resulting solution will be more than seven.

The pH of the resulting solution will be less than seven

1 and 2

2 and 3

1 and 4

3 and 4

4 / 25

Which of the following reactions is an endothermic reaction?

Burning of coal.

Decomposition of vegetable matter into compost

Process of respiration.

Decomposition of calcium carbonate to form quick lime and carbon dioxide

5 / 25

One of the following does not happen during a chemical reaction.

Breaking of old chemical bonds and formation of new chemical bonds

Formation of new substances with entirely diferent properties

Atoms of one element change into those of another element to form new products

A rearrangement of atoms takes place to form new products

6 / 25

If 10 mL of H₂SO₄ is mixed with 10 mL of Mg(OH)₂ of the same concentration, the resultant solution will give the following colour with universal indicator:

Red

Yellow

Green

Blue

7 / 25

To preserve tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

Acidic

Neutral

Basic

Corrosive

8 / 25

Which of the following declaration is true for acids?

Bitter and change red litmus to blue

Sour and change red litmus to blue.

Sour and change blue litmus to red

Bitter and change blue litmus to red.

9 / 25

Which of the subsequent phenomena occur, when a slight amount of acid is added to water?

It turns lime water milky

It extinguishes a burning splinter.

It dissolves in a solution of sodium hydroxide.

It has a pungent odour

1 and 3

1 and 2

2 and 3

2 and 4

10 / 25

The chemical used in manufacture of soaps

Na₂Co₃

NaOH

NACo₄

Na₂OH

11 / 25

Which of the following are the characteristics of isotopes of an element?

Isotopes of an element have the same atomic masses.

Isotopes of an element have the same atomic number

Isotopes of an element show the same physical properties.

Isotopes of an element show the same chemical properties.

2 and 4

1 and 3

2 and 3

1 and 4

12 / 25

Arrange the following elements in sequence of their increasing non-metallic character Li, O, C, Be and F.

F < O < C < Be < Li

Li < Be < C < O < F

F < O < C < Be < Li

F < O < Be < C < Li

13 / 25

Which one of the following does not increase while moving down in group of the periodic table?

Atomic radius

Metallic character

Valence

Number of shells in an element

14 / 25

The atomic number of an element is 20, its electronic configuration.

2, 8, 4, 2,

2, 8, 8, 2,

4, 8, 8, 2,

8, 8, 2,2

15 / 25

Is calcium?

metal

non metal

both

none of these

16 / 25

Ester is formed by the reaction between:

An acid and an alcohol

An acid and a base

A base and an alcohol

An acid and an alkene

17 / 25

The number of covalent bonds in the molecule of ethane.

4

7

3

1

18 / 25

The formula of cyclopentane

C6H10

C4H10

C5H10

C3H10

19 / 25

Unsaturated hydrocarbon undergoes incomplete combustion and burns with

blue fame

red fame

white fame

yellow fame

20 / 25

Chemical name of the compound CH₃—CH₂—CH₂—Br

1-Bromo Propane

2-Bromo Propane

3-Bromo Propane

4-Bromo Propane

21 / 25

Non-metals are not lustrous. Which of the following non-metals is lustrous?

Sulphur

Oxygen

Nitrogen

Iodine

22 / 25

The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

X is a metal

Y is a non-metal and Z is a metal

23 / 25

Hydrogen gas is not evolved when a metal reacts with nitric acid because

nitric acid is a strong oxidising agent.

nitric acid is a strong reducing agent.

nitric acid is a strong neutralising agent.

non of these

24 / 25

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Al and Cl₂

AlCl₄

AlCl₂

AlCI₃

None of these

25 / 25

Which metal is less reactive?

calcium

sodium

both 1 & 2

none of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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