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

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

H₂O

F₂

HF

O₂

3 / 25

The following reaction is used for the preparation of oxygen gas in the laboratory: 2KClO₃(s) Heat ⎯ → Catalyst ⎯⎯⎯ 2KCl(s) + 3O₂(g) Which of the following statement(s) is/are correct about the reaction?

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

4 / 25

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Designate the accurate observation:

The surface of metal becomes shiny.

The reaction mixture turns milky.

Odour of a pungent smelling gas is recorded.

A colourless and odourless gas is evolved

5 / 25

Calcium oxide reacts vigorously with water to produce slaked lime. CaO(s) + H₂O(l) → Ca(OH)₂(aq) This reaction can be classified as:

Combination reaction

Exothermic reaction

Endothermic reaction

Oxidation reaction

1 and 3

3 and 4

1, 3 and 4

1 and 2

6 / 25

Which of the following gives the exact increasing order of acid strength?

Water < acetic acid < hydrochloric acid

Water < hydrochloric acid < acetic acid

Acetic acid < water < hydrochloric acid

Hydrochloric acid < water < acetic acid

7 / 25

Which of the following is not a mineral acid?

Hydrochloric acid

Citric acid

Sulphuric acid

Nitric acid

8 / 25

What types of ions are formed when a base is dissolved in water ?

H+ ions are formed

OH- ions

allof these

9 / 25

Common name calcium sulphate hemihydrate

lime stone

Plaster of paris

white stone

none

10 / 25

The other name of methanoic acid is

Formic acid

sulpuric acid

Hydrochloric acid

none

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

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

Group 8

Group 2

Group 18

Group 10

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

Which among the following has larger size of atoms?

Li

Fr

Na

Be

15 / 25

How many metals are present in second period of periodic table?

10

6

8

2

16 / 25

From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

17 / 25

Which of the following substance produces brisk effervescence with baking soda solution?

Ethanoic acid

Table salt

Vinegar

Sunflower oil

18 / 25

Ethane is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

19 / 25

Rich conductors of electricity.

covalent compounds

ionic compounds

molecular compounds

All of these

20 / 25

The next homologue of C₄H₆

C₅H₁₀

C₅H₈

C₅H₅

C₅H₆

21 / 25

Which of the subsequent oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

FeO

Fe₂O₃

Fe₃O₄

Fe₂O₃ and Ce₃O₄

22 / 25

The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

X is a metal

Y is a non-metal and Z is a metal

23 / 25

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

Sulphur

Graphite

PVC

All can be used

24 / 25

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

AI

Au

Cu

Pt

2 and 4

1

2

1 and 3

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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