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

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

2 / 25

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

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

3 / 25

State the reactions are exothermic or endothermic in nature: Dissolution of ammonium chloride in water

exothermic reaction

endothermic reaction

Both 1 & 2

none of these

4 / 25

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Designate the accurate observation:

The surface of metal becomes shiny.

The reaction mixture turns milky.

Odour of a pungent smelling gas is recorded.

A colourless and odourless gas is evolved

5 / 25

The following reaction is an example of a: 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Displacement reaction

Combination reaction

Redox reaction

Neutralisation reaction

1 and 4

2 and 3

1 and 3

3 and 4

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 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.

8 / 25

The chemical formula for methonic acid

H2COH

HOOCH

HCOOH

None

9 / 25

The source of lactic acid is

curd

milk

butter

none

10 / 25

Washing soda is prepared from

sodium chloride

sodium carbonate

sodium hydroxide

sodium nitrate

11 / 25

Which of the following gives the accurate increasing order of the atomic radii of O, F and N?

O, F, N

N, F, O

O, N, F

F, O, N

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

What type of oxide would Eka-aluminium form?

EO₃

E₃O₂

E₂O₃

EO

14 / 25

How many metals are present in second period of periodic table?

10

6

8

2

15 / 25

Arrange the following elements in increasing order of their atomic radii:

l < Br < Cl < At

At < Br < I < Cl

Cl < I < Br < At

Cl < Br < I < At

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

Which of the followings is the major constituent of the liquefied petroleum gas?

Methane

Ethane

Propane

Butane

18 / 25

Which of the following is the molecular formula of cyclobutane?

C4H10

C4H6

C4H8

C4H4

19 / 25

Ethane is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

20 / 25

UnSaturated hydrocarbons contains

double/triple covalent bonds

single covalent bonds

four covalent bonds

five covalent bonds

21 / 25

Which one of the following four metals would be replaced from the solution of its salts by the other three metals?

Mg

Ag

Zn

Cu

22 / 25

Which metal can be displaced by copper from its salt solution?

Silver & zinc

Silver & mercury

Iron & silver

Iron & mercury

23 / 25

Non-metal that can exist in diferent forms

gold

carbon

platinum

iodine

24 / 25

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (molecular mass = 40) and liberates a gas Z which easily catches fre. Identify X, Y and Z.

X = Sodium Hydroxide (NaOH) Y = Sodium(Na) Z = Hydrogen gas (H2)

X = Sodium (Na) Y = Sodium hydroxide (NaOH) Z = Hydrogen gas (H2

X = Hydrogen gas Y = Sodium hydroxide (NaOH) Z = Sodium( Na)

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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