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

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

Which of the subsequent is (are) an endothermic process(es)?

Dilution of sulphuric acid

Sublimation of dry ice

Condensation of water vapours

Evaporation of water

1 and 2

2

3

2 and 4

4 / 25

One of the following processess doesnot require a chemical reaction:

Melting of candle wax when heated

Burning of candle wax when heated

Digestion of food in your stomach

Ripening of banana

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

Which of the following solutions in water does not conduct electricity?

Hydrochloric acid

Sodium chloride

Glucose

Sulphuric 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

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

The pH of pure water is

4

5

6

7

10 / 25

The chemical used for cleaning swimming pools

chlorine

Bromium

Potassium

none

11 / 25

An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is:

XY

XY₂

X₂Y

X₂Y₃

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

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

10

6

8

2

14 / 25

The atomic number of an element is 20, its valency is

2

8

16

4

15 / 25

Is calcium?

metal

non metal

both

none of these

16 / 25

Ester is formed by the reaction between:

An acid and an alcohol

An acid and a base

A base and an alcohol

An acid and an alkene

17 / 25

What is denatured alcohol?

Ethyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Methyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Alcohol having properties of an acid

Ethyl alcohol containing 60% of water by weight

18 / 25

The ability of an atom to form bonds with other atoms of the same element.

Carbonation

Catenation

Atom combination

Isomerism

19 / 25

The strong electrostatic interactions between ions formed by the transfer of electrons

covalent compounds

ionic compounds

both 1 & 2

none

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

Which of the following is not a property of ionic compounds ?

They are generally solids and somewhat hard.

They have high melting and boiling points

They are soluble in solvents such as kerosene and petrol etc.

They conduct electricity in molten state

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

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

24 / 25

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Li and O₂

Li₂O

Lio₂

Li₃O

LiO₃

25 / 25

Name two metals having melting point less than 310 K (37°C).

gold & silver

mercury & silver

cesium (Cs) and gallium (Ga).

none of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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