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

What happens when sodium sulphate solution is added to barium chloride solution?

a red precipitate of barium sulphate is formed.

a white precipitate of barium chloride is formed.

a white precipitate of barium sulphate is formed.

2 / 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.Write the chemical name of the black precipitate formed.

hydrogen sulphide

copper sulphide.

hydrogen sulphate

none of these

3 / 25

Mention whether it is physical or chemical changes: Sublimation of solid ammonium chloride

physical

chemical

Both 1 & 2

none of these

4 / 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

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 Subsequent salts does not carry water of crystallisation?

Blue vitriol

Baking soda

Washing soda

Gypsum

7 / 25

A visually challenged student, has to carryout a lab test to detect the presence of acid in a given solution. The acid-base indicator favoured by him will be:

Blue litmus

Clove oil

Red cabbage extract

Hibiscus extract

8 / 25

Name the acid along present in ant sting

methanoic acid

sulphuric acid

Hydrochloric acid

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

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

In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which of the subsequent element found a place in the periodic table later?

Germanium

Chlorine

Oxygen

Silicon

13 / 25

Which is not true about the noble gases?

They exist in atomic form

They are non metallic in nature

Xenon is the most reactive.

They are radioactive in nature

14 / 25

Modern Periodic Law States that

Properties of elements are a periodic function of their atomic masses

Properties of elements are a periodic function of their atomic number

Properties of elements are a periodic function of their atomic size

Properties of elements are a periodic function of their Mass number

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

A molecule of ammonia (NH₃) has:

Only single bonds

Only double bonds

Only triple bonds

Two double bonds and one single bond

17 / 25

The number of covalent bonds in the molecule of ethane.

4

7

3

1

18 / 25

Unsaturated hydrocarbon undergoes incomplete combustion and burns with

blue fame

red fame

white fame

yellow fame

19 / 25

Ethene is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

20 / 25

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

covalent compounds

ionic compounds

both 1 & 2

none

21 / 25

Which one of the following properties is not commonly exhibited by ionic compounds?

Solubility in water

Electrical conductivity in solid state

High melting and boiling points

Electrical conductivity in molten state

22 / 25

Which of the consecutive are not ionic compounds?

KCl

HCl

CCl₄

NaCl

2 and 3

1 and 2

1 and 3

3 and 4

23 / 25

Name a metal that have very low melting points.

Gallium

Tungsten

platinium

Diamond

24 / 25

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

Li₂O

Lio₂

Li₃O

LiO₃

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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