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

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

physical

chemical

Both 1 & 2

none of these

2 / 25

Mention whether it is physical or chemical changes:- Burning of Liquefied Petroleum Gas (LPG)

chemical

physical

Both 1 & 2

none of these

3 / 25

Mention whether it is physical or chemical changes :Curdling of milk

chemical

physical

Both 1 & 2

none of these

4 / 25

Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be designated as:

displacement and redox

decomposition and redox

displacement and endothermic

decomposition and exothermic.

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

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

Basic

Acidic

Neutral

Amphoteric

7 / 25

Common salt other than being used in kitchen can also be used as the raw material for making:

Washing soda

Bleaching powder

Baking soda

Slaked lime

1 and 3

1 and 2

1, 2 and 3

1, 3 and 4

8 / 25

Which of the subsequent is/are true when HCl(g) is passed through water?

It does not ionise in the solution as it is a covalent compound

It ionises in the solution

It gives both hydrogen and hydroxyl ions in the solution.

It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

2 and 4

1

2

3 and 4

9 / 25

Hydrogen is used in manufacture

of ammonia for fertilizers and as Rocket fuel.

soaps

dyes

none

10 / 25

Which of the following statements is true for acids?

Bitter and change red litmus to blue

Sour and change red litmus to blue

Sour and change blue litmus to red.

Bitter and change blue litmus red

11 / 25

Which of the specified elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively affiliated to the same period?

A, B, C

B, C, D

A, D, E

B, D, E

12 / 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

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

The valency of an element vary across a period

increases

Decreases

Remains constant

increases/decreases

15 / 25

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

Metal

Non metal

Metalloids

Metal, non-metal and metalloid respectively

16 / 25

Cation is formed when:

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

17 / 25

The formula of cyclopentane

C6H10

C4H10

C5H10

C3H10

18 / 25

Molecular formula of Methane

CH₆

CH₄

CH₅

CH₃

19 / 25

The molecular formula of Ethanol

C₂H₆OH

C₂H₇OH

C₂H₅OH

C₂HOOH

20 / 25

Chemical name of the compound CH₃—CH₂—CH₂—Br

1-Bromo Propane

2-Bromo Propane

3-Bromo Propane

4-Bromo Propane

21 / 25

Electrical wires have a coating of an insulating material. The material, overall adopted is:

Sulphur

Graphite

PVC

All can be used

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

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

Silver & zinc

Silver & mercury

Iron & silver

Iron & mercury

24 / 25

Why do ionic compounds conduct electricity in molten state? Because

the ions move freely in molten state.

the ions move freely in solid state.

the ions move freely in gaseous state.

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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