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

Give an example of decomposition reaction taking place in our body.

reproduction

digestion

blood circulation

respiration

2 / 25

Sate the reactions exothermic or endothermic in nature: Dissolution of sodium hydroxide in water

endothermic reaction

both 1 & 3

exothermic reaction

all of these

3 / 25

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Identify the brown gas X evolved.

X is nitrogen dioxide gas (NO2) that has evolved as brown, choking fumes

X is copper oxide gas that has evolved as brown, choking fumes

X is oxygen gas that has evolved as brown, choking fumes.

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

Which among the following is (are) double displacement reaction(s)?

Pb + CuCl₂ → PbCl₂ + Cu

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

C + O₂ → CO₂

CH₄ + 2O₂ → CO₂ + 2H₂O

1 and 4

2

1 and 2

3 and 4

6 / 25

Baking soda is a blend of:

Sodium carbonate and acetic acid

Sodium carbonate and tararic acid

Sodium hydrogen carbonate and tartaric acid

Sodium hydrogen carbonate and acetic acid

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

Washing soda is prepared from

sodium chloride

sodium carbonate

sodium hydroxide

sodium nitrate

9 / 25

On strong heating, blue coloured copper sulphate crystals turns

purple

red

white

blue

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 following affirmation about the modern periodic table are inappropriate?

The elements in the modern periodic table are arranged on the basis of their decreasing atomic numbers

The elements in the modern periodic table are arranged on the basis of their increasing atomic masses.

Isotopes are placed in adjoining group(s) in the periodic table.

The elements in the modern periodic table are arranged on the basis of their increasing atomic number

1,2 and 3

1 and 2

2 and 3

3

12 / 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

13 / 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

14 / 25

The valency of an element vary across a period

increases

Decreases

Remains constant

increases/decreases

15 / 25

The formulae of chlorides of Eka-silicon the elements predicted by Mendeleev.

GeCl

GeCl2

GeCl4

GeCl3

16 / 25

Which of the followings is the major constituent of the liquefied petroleum gas?

Methane

Ethane

Propane

Butane

17 / 25

From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

18 / 25

The formula of cyclopentane

C6H10

C4H10

C5H10

C3H10

19 / 25

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

covalent compounds

ionic compounds

both 1 & 2

none

20 / 25

The next homologue of C₄H₆

C₅H₁₀

C₅H₈

C₅H₅

C₅H₆

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

The composition of aqua-regia is:

Dil. HCI : Conc. HNO₃ 3 : 1

Conc. HCI: Dil. HNO₃ 3 : 1

Conc. HCl: Conc. HNO₃ 3 : 1

Dil. HCl : Dil. HNO₃ 3 : 1

23 / 25

The Lustrous non-metal

mercury

iodine

iron

almunium

24 / 25

Metal that is best conductor of electricity

mercury

gold

iodine

silver

25 / 25

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

bromine

mercury

Ballium

gold

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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