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

Identify the reducing agent in the following reactions: 2H₂O + 2F₂ → 4HF + O₂

H₂O

F₂

HF

O₂

2 / 25

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

chemical

physical

Both 1 & 2

none of these

3 / 25

State the reactions are exothermic or endothermic in nature: Decomposition of ferrous sulphate

endothermic reaction

exothermic reaction

Both 1 & 2

all of these

4 / 25

Which of the following gases can be used for the storage of fresh sample of an oil for a long duration?

Carbon dioxide or oxygen

Nitrogen or oxygen

Carbon dioxide or helium

Helium or nitrogen

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

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

Basic

Acidic

Neutral

Amphoteric

7 / 25

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Wash the hand with a saline solution

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

After washing with plenty of water, apply a solution of sodium hydroxide on the hand

Neutralise the acid with a strong alkali

8 / 25

To preserve tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

Acidic

Neutral

Basic

Corrosive

9 / 25

Which of the following statements is accurate about an aqueous solution of an acid and a base?

Higher the pH, stronger the acid

Higher the pH, weaker the acid

Higher the pH, stronger the base

Lower the pH, weaker the base

1 and 3

2 and 3

2 and 4

1 and 4

10 / 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

11 / 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

12 / 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

13 / 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

14 / 25

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

GaCl₄

GaCl₂

GaCl

GaCl₃

15 / 25

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

Metal

Non metal

Metalloids

Metal, non-metal and metalloid respectively

16 / 25

The electronic configuration of an element is found to be 2, 4. How many bonds can one carbon atom form in a compound?

1

2

4

6

17 / 25

How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene?

30

60

90

120

18 / 25

Ethane is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

19 / 25

Molecular formula of Methane

CH₆

CH₄

CH₅

CH₃

20 / 25

The name of the fourth member of alkane series.

ethyene

pentane

Butane

ethene

21 / 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

22 / 25

Which one of the following four metals would be replaced from the solution of its salts by the other three metals?

Mg

Ag

Zn

Cu

23 / 25

Which of the following Metal have very low melting points?

Gallium

titanium

uranium

copper

24 / 25

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

bromine

mercury

Ballium

gold

25 / 25

Which metal is less reactive?

magnesium

calcium

both 1 & 2

none of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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