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.Why does the colour of the solution fades?

due to its reaction with hydrogen sulphide gas and results into the formation of colourless solution of sulphuric acid.

due to its reaction with Copper sulphate gas and results into the formation of colourless solution of sulphuric acid.

Both 1 & 2

all of these

2 / 25

Mention whether it is a physical or chemical changes: -Evaporation of petrol

physical

chemical

Both 1 & 2

none of these

3 / 25

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

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

4 / 25

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should blend with it a solution of:

potassium nitride

potassium sulphide

potassium iodide

5 / 25

Which among the following is (are) double displacement reaction(s)?

Pb + CuCl₂ → PbCl₂ + Cu

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

C + O₂ → CO₂

CH₄ + 2O₂ → CO₂ + 2H₂O

1 and 4

2

1 and 2

3 and 4

6 / 25

Calcium phosphate is present in tooth enamel. Its nature is:

Basic

Acidic

Neutral

Amphoteric

7 / 25

Which of the following gives the exact increasing order of acid strength?

Water < acetic acid < hydrochloric acid

Water < hydrochloric acid < acetic acid

Acetic acid < water < hydrochloric acid

Hydrochloric acid < water < acetic acid

8 / 25

What types of ions are formed when a base is dissolved in water ?

H+ ions are formed

OH- ions

allof these

9 / 25

The chemical used for cleaning swimming pools

chlorine

Bromium

Potassium

none

10 / 25

Common name calcium sulphate hemihydrate

lime stone

Plaster of paris

white stone

none

11 / 25

Which of the following declaration about the modern periodic table is accurate?

It has 18 horizontal rows known as periods.

It has 7 vertical columns rows known as periods

It has 18 vertical columns known as groups.

It has 7 horizontal rows known as groups.

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

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

The number of groups in the Modern Periodic Table

18

14

12

10

15 / 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

16 / 25

The organic compounds having functional group are known as:

Aldehyde

Ketone

Carboxylic acids

Alcohol

17 / 25

Unsaturated hydrocarbon undergoes incomplete combustion and burns with

blue fame

red fame

white fame

yellow fame

18 / 25

Ethene is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

19 / 25

Rich conductors of electricity.

covalent compounds

ionic compounds

molecular compounds

All of these

20 / 25

The name of the fourth member of alkane series.

ethyene

pentane

Butane

ethene

21 / 25

Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

H₂SO₄

HCI

HNO₂

All of these

22 / 25

Metals are solid in nature. Which one of the Subsequent metals is found in liquid condition at room temperature?

Na

Fe

Cr

Hg

23 / 25

The metals that float when dealt with water are:

Manganese and sodium

Manganesium and sodium

sodium and calcium

Magnesium and Calcium

24 / 25

What occurs when calcium is treated with water?

It does not react with water.

It reacts violently with water. I

t reacts less violently with water.

Bubbles of hydrogen gas formed stick to the surface of calcium.

3 and 4

1 and 3

2 and 3

1 and 4

25 / 25

Name a metal which is highly malleable

Gold

Silver

both 1 & 2

none of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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