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

Which reaction takes place when layer of silver deposit on copper wire when dipped in silver nitrate solution?

displacement reaction

replacement reaction

oxidation

reduction reaction

2 / 25

Why are oil and fat containing food items fushed with nitrogen while packing?

to prevent reduction

To prevent rancid

to increase oxidation

none of these

3 / 25

Mention whether it is physical or chemical changes :Curdling of milk

chemical

physical

Both 1 & 2

none of these

4 / 25

State the reactions exothermic or endothermic in nature: Dilution of sulphuric acid

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

5 / 25

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Identify the brown gas X evolved.

X is nitrogen dioxide gas (NO<sub>2</sub>) that has evolved as brown, choking fumes

X is copper oxide gas that has evolved as brown, choking fumes

X is oxygen gas that has evolved as brown, choking fumes.

none of these

6 / 25

The chemical formula for plaster of Paris is :

CaSO₄.2H₂O

CaSO₄.H₂O

CaSO₄. 1/2H₂O

2CaSO₄.H₂O

7 / 25

Which of the following substances will not give carbon dioxide on treatment with dilute acid?

Marble

Limestone

Baking soda

Lime

8 / 25

Identify the true representation of reaction occurring during chloralkali process.

2NaCl(l) + 2H₂O(l) → 2NaOH(l) + Cl₂(g) + H₂(g)

2NaCl(l) + 2H₂O(aq) → 2NaOH(aq) + Cl₂(g) + H₂(aq)

2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(aq) + H₂(aq)

2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(g) + H₂(g)

9 / 25

What will take place when the solution of an acid is blend with the solution of a base in a test tube?

The temperature of the solution increases

The temperature of the solution decreases

The temperature of the solution remains the same

Salt formation takes place

1 and 4

1

1 and 3

2 and 4

10 / 25

Antacid are

Acidic in nature

Basic in nature

both

none

11 / 25

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the identical group?

A and B

B and D

A and C

D and E

12 / 25

Where would you establish the element with electronic confguration 2, ǫ in the modern periodic table?

Group 8

Group 2

Group 18

Group 10

13 / 25

An element which is a crucial constituent of all organic compounds belongs to:

Group 1

Group 14

Group 15

Group 16

14 / 25

The atomic number of an element is 20, its valency is

2

8

16

4

15 / 25

Three elements B, Si and Ge are: Metalloids (d)

Metal

Non metal

Metalloids

Metal, non-metal and metalloid respectively

16 / 25

Carbon exists in the atmosphere in the form of:

Only carbon monoxide

Carbon monoxide in traces and carbon dioxide

Only carbon dioxide

Coal

17 / 25

A molecule of ammonia (NH₃) has:

Only single bonds

Only double bonds

Only triple bonds

Two double bonds and one single bond

18 / 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

19 / 25

What is denatured alcohol?

Ethyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Methyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Alcohol having properties of an acid

Ethyl alcohol containing 60% of water by weight

20 / 25

Rich conductors of electricity.

covalent compounds

ionic compounds

molecular compounds

All of these

21 / 25

The solution of one of the following compounds will not conduct electricity. This compounds is:

NaCl

CCl₄

MgCl₂

CaCl₂

22 / 25

Which one of the following properties is not commonly exhibited by ionic compounds?

Solubility in water

Electrical conductivity in solid state

High melting and boiling points

Electrical conductivity in molten state

23 / 25

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

Sulphur

Oxygen

Nitrogen

Iodine

24 / 25

Which of the following Metal have very low melting points?

Gallium

titanium

uranium

copper

25 / 25

Name one non-metal that exist in liquid state at room temperature.

bromine

mercury

Ballium

gold

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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