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 type of reaction is represented by: A + BC → AC + B ?

oxidation reaction

replacement reaction

displacement reaction

none of these

2 / 25

Identify the reducing agent in the following reactions 4NH₃ + 5O₂ → 4NO + 6H₂O

O₂

NH₃

NO

H₂O

3 / 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

4 / 25

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is:

1:01

2:01

4:01

1:02

5 / 25

When hydrogen sulphide gas is passed through a blue solution of copper sulphate a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remain in the solution. The reaction is an example of a:

Combination reaction

Displacement reaction

Decomposition reaction

Double displacement reaction

6 / 25

identical volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?

Red

Yellow

Yellowish green

Blue

7 / 25

Which among the following is not a base?

NaOH

KOH

NH₄OH

C₂H₅OH

8 / 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

9 / 25

Name the acid along present in ant sting

methanoic acid

sulphuric acid

Hydrochloric acid

none

10 / 25

On strong heating, blue coloured copper sulphate crystals turns

purple

red

white

blue

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

An element X is forming acidic oxide. Its most expected position in the modern periodic table is:

Group 1 and Period 3

Group 16 and Period 3

Group 17 and Period 3

Group 2 and Period 3

13 / 25

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

K shell

L shell

M shell

N shell

14 / 25

Which of the following elements would lose an electron with ease?

Mg

Na

K

Ca

15 / 25

The number of groups in the Modern Periodic Table

18

14

12

10

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

Ethene is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

18 / 25

The compounds have low melting and boiling points.

covalent compounds

ionic compounds

molecular compounds

both 1 & 2

19 / 25

Rich conductors of electricity.

covalent compounds

ionic compounds

molecular compounds

All of these

20 / 25

UnSaturated hydrocarbons contains

double/triple covalent bonds

single covalent bonds

four covalent bonds

five covalent bonds

21 / 25

Which of the subsequent quality is generally not shown by metals?

Electrical conduction

Sonorous in nature

Dullness

Ductility

22 / 25

Shwetha took three beakers A, B and C containing zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces were added to each beaker. The solution will Become visible blue in the case of:

Beaker A

Beaker B

Beaker C

Beaker B and C

23 / 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

24 / 25

Non-metal that can exist in diferent forms

gold

carbon

platinum

iodine

25 / 25

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

bromine

mercury

sodium

silver

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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