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

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

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

3 / 25

The following reaction is used for the preparation of oxygen gas in the laboratory: 2KClO₃(s) Heat ⎯ → Catalyst ⎯⎯⎯ 2KCl(s) + 3O₂(g) Which of the following statement(s) is/are correct about the reaction?

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

4 / 25

Calcium oxide reacts vigorously with water to produce slaked lime. CaO(s) + H₂O(l) → Ca(OH)₂(aq) This reaction can be classified as:

Combination reaction

Exothermic reaction

Endothermic reaction

Oxidation reaction

1 and 3

3 and 4

1, 3 and 4

1 and 2

5 / 25

Which of the following are combination reactions?

KClO₃ →^(Heat)→ 2KCl + 3O₂

MgO + H₂O → Mg(OH)₂

4Al + 3O₂ → 2Al2O₃

Zn + FeSO₄ →ZnSO₄ + Fe

1 and 4

3 and 4

2 and 4

2 and 3

6 / 25

Which of the following statements is accurate about an aqueous solution of an acid and a base?

Higher the pH, stronger the acid

Higher the pH, weaker the acid

Higher the pH, stronger the base

Lower the pH, weaker the base

1 and 3

2 and 3

2 and 4

1 and 4

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

The chemical formula for methonic acid

H2COH

HOOCH

HCOOH

None

9 / 25

The chemical used in manufacture of soaps

Na₂Co₃

NaOH

NACo₄

Na₂OH

10 / 25

Hydrogen is used in manufacture

of ammonia for fertilizers and as Rocket fuel.

soaps

dyes

none

11 / 25

As claimed by Mendeleev’s periodic law, the elements were arranged in the periodic table in the order of:

Increasing atomic number

Decreasing atomic number

Increasing atomic masses

Decreasing atomic masses

12 / 25

Which of the subsequent is the outermost shell for elements of period 2?

K shell

L shell

M shell

N shell

13 / 25

Which of the following are the characteristics of isotopes of an element?

Isotopes of an element have the same atomic masses.

Isotopes of an element have the same atomic number

Isotopes of an element show the same physical properties.

Isotopes of an element show the same chemical properties.

2 and 4

1 and 3

2 and 3

1 and 4

14 / 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

15 / 25

Three elements B, Si and Ge are:

Metals

Non-metals

Metalloids

Metal, non-metal and metalloid

16 / 25

How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene?

30

60

90

120

17 / 25

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

Catenation

Isomerisation

Superposition

Halogenation

18 / 25

Cation is formed when:

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

19 / 25

Ethene is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

20 / 25

Rich conductors of electricity.

covalent compounds

ionic compounds

molecular compounds

All of these

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

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

AI

Au

Cu

Pt

2 and 4

1

2

1 and 3

23 / 25

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

bromine

mercury

Ballium

gold

24 / 25

A non-metal X exists in two diferent forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

X is diamond; Y is graphite ; Z is carbon

X is carbon; Y is diamond ; Z is graphite

X is diamond; Y is carbon ; Z is graphite

none of these

25 / 25

which metal is more 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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