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

Why are anti-oxidants added to fat and oil containing food items?

To prevent oxidation

to increase oxidation

to prevent reduction

all of these

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

Which of the following is not a physical change?

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefed Petroleum Gas

4 / 25

When copper turning are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because copper ?

Displaces silver from the solution

Forms a blue colored complex with AgNO₃

Is oxidized to Cu₂₊

Is reduced to Cu₂₊

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

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

H+ ions are formed

H20 +

OH- ions

None

7 / 25

The pH of pure water is

4

5

6

7

8 / 25

The chemical used in manufacture of soaps

Na₂Co₃

NaOH

NACo₄

Na₂OH

9 / 25

Washing soda is prepared from

sodium chloride

sodium carbonate

sodium hydroxide

sodium nitrate

10 / 25

Common name calcium sulphate hemihydrate

lime stone

Plaster of paris

white stone

none

11 / 25

Where would you establish the element with electronic confguration 2, ǫ in the modern periodic table?

Group 8

Group 2

Group 18

Group 10

12 / 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

13 / 25

Which one of the following does not increase while moving down in group of the periodic table?

Atomic radius

Metallic character

Valence

Number of shells in an element

14 / 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

15 / 25

Three elements B, Si and Ge are: Metalloids (d)

Metal

Non metal

Metalloids

Metal, non-metal and metalloid respectively

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

From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

18 / 25

A saturated hydrocarbon undergoes complete combustion and burns with

blue flame

red flame

orange flame

white flame

19 / 25

Ethane 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

An aluminium strip is retained immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change state is that:

Green solution slowly turns brown

Lower end of test tube becomes slightly warm

A colourless gas with the smell of burning sulphur is observed

Light green solution changes to blue

22 / 25

In the given reaction, Al₂O₃ + NaOH → …X… + H₂O. What is element X?

NaAlO2

Na3Al

Na2O3

NaAl2O3

23 / 25

Which metal can be displaced by copper from its salt solution?

Silver & zinc

Silver & mercury

Iron & silver

Iron & mercury

24 / 25

The Most malleable and ductile metal

mercury

sodium

gold

silver

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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