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

Identify the reducing agent in the following reactions: 2H₂O + 2F₂ → 4HF + O₂

H₂O

F₂

HF

O₂

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

When hydrogen sulphide gas is passed through a blue solution of copper sulphate a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remain in the solution. The reaction is an example of a:

Combination reaction

Displacement reaction

Decomposition reaction

Double displacement reaction

5 / 25

Which of the subsequent does show an oxidation reaction

Gain of oxygen

Loss of oxygen

Gain of hydrogen

None of the above

6 / 25

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

Marble

Limestone

Baking soda

Lime

7 / 25

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following declaration are true about the gas evolved?

It turns lime water milky

It extinguishes a burning splinter.

It dissolves in a solution of sodium hydroxide.

It has a pungent odour

1,2 and 3

1 and 2

1 and 4

2, 3 and 4

8 / 25

Antacid are

Acidic in nature

Basic in nature

both

none

9 / 25

The source of citric acid is

lemon

vinegar

orange

none

10 / 25

Washing soda is prepared from

sodium chloride

sodium carbonate

sodium hydroxide

sodium nitrate

11 / 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

12 / 25

Which of the following is the outermost shell for elements of period 2

K shell

L shell

M shell

N shell

13 / 25

The metallic character vary across the period

It moves right to left in peroidic table

It moves left to right in peroidic table

Remains constant

none of these

14 / 25

The number of Periods in the Modern Periodic Table are

6

7

2

1

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

Buckminsterfullerene is an allotropic form of:

Phosphorus

Sulphur

Carbon

Tin

17 / 25

The property of self-linkage among identical atoms to form long chain compounds is known as:

Catenation

Isomerisation

Superposition

Halogenation

18 / 25

The I.U.P.A.C name of CH₃CH₂CH=CH₂ is?

3-Butene

Prop-1-ene

But-1-ene

Butyne

19 / 25

The compounds formed by the sharing of electron pairs between two atoms.

covalent compounds

ionic compounds

both 1 & 2

none

20 / 25

The name of the fourth member of alkane series.

ethyene

pentane

Butane

ethene

21 / 25

Which of the following Metal have very low melting points?

Gallium

titanium

uranium

copper

22 / 25

The metals that float when dealt with water are:

Manganese and sodium

Manganesium and sodium

sodium and calcium

Magnesium and Calcium

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

Why should we not throw small pieces of sodium into a sink in the laboratory? Because of

endothermic reaction

exothermic reaction

oxidation

none of these

25 / 25

Give the formula of the stable binary compound that would be formed by the combination of following pair of elements: Mg and N₂

Mg3N2

MgN2

MgN

MgN3

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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