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: 2H₂O + 2F₂ → 4HF + O₂

H₂O

F₂

HF

O₂

2 / 25

Mention whether it is physical or chemical changes:- Burning of Liquefied Petroleum Gas (LPG)

chemical

physical

Both 1 & 2

none of these

3 / 25

Mention whether it is physical or chemical changes : Heating of an iron rod to red hot

physical

chemical

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

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

Which of the Subsequent salts does not carry water of crystallisation?

Blue vitriol

Baking soda

Washing soda

Gypsum

7 / 25

The chemical formula for plaster of Paris is :

CaSO₄.2H₂O

CaSO₄.H₂O

CaSO₄. 1/2H₂O

2CaSO₄.H₂O

8 / 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

9 / 25

What types of ions are formed when an acid is dissolved in water ?

H+ ions are formed

H<sub>2</sub>0 +

OH- ions

None

10 / 25

The chemical used in manufacture of soaps

Na₂Co₃

NaOH

NACo₄

Na₂OH

11 / 25

On the basis of electronic confguration of X9 5 , the group number and period of the element ‘X‘ is:

Group 15 period 2

Group 13 period 2

Group 9 period 5

Group 13 period 5

12 / 25

Arrange these elements in decreasing order of their atomic radii

Carbon Nitrogen Oxygen Fluorine

Fluroine oxygen carbon Nitrogen

Nitrogen Oxygen Carbon Fluroine

Oxygen Nitrogen Fluroine Carbon

13 / 25

Why does atomic radius decreases as we move from left to right in a period

due to increase in nuclear charge which tends to pull the electrons closer to the nucleus.

due to decrease in nuclear charge which tends to pull the electrons closer to the nucleus.

due to no change in nuclear charge which tends to pull the electrons closer to the nucleus.

none of these

14 / 25

Which among the following has larger size of atoms?

Li

Fr

Na

Be

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

Cation is formed when:

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

18 / 25

The ability of an atom to form bonds with other atoms of the same element.

Carbonation

Catenation

Atom combination

Isomerism

19 / 25

Ethane is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

20 / 25

The name of the fourth member of alkane series.

ethyene

pentane

Butane

ethene

21 / 25

Which of the subsequent quality is generally not shown by metals?

Electrical conduction

Sonorous in nature

Dullness

Ductility

22 / 25

Which of the subsequent oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

FeO

Fe₂O₃

Fe₃O₄

Fe₂O₃ and Ce₃O₄

23 / 25

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire.

Due to high exothermic hydrogen evolved immediately catches fre

Due to low exothermic hydrogen evolved immediately catches fre

Due to high endothermic hydrogen evolved immediately catches fre

Due to low endothermic hydrogen evolved immediately catches fre

24 / 25

A Metal that exists in liquid state at room temperature

gold

mercury

sodium

silver

25 / 25

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: K and O₂

K₃O

K₂O

K₄O

None of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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