Science : Ch 01 – Chemical Reactions and Equations

Science : Ch 01 - Chemical Reactions and Equations

This test is designed based on NCERT Syllabus for Class 10 Topics : Chemical Reactions and Equations

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

What happens when sodium sulphate solution is added to barium chloride solution?

a red precipitate of barium sulphate is formed.

a white precipitate of barium chloride is formed.

a white precipitate of barium sulphate is formed.

2 / 15

Why are anti-oxidants added to fat and oil containing food items?

To prevent oxidation

to increase oxidation

to prevent reduction

all of these

3 / 15

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

O₂

NH₃

NO

H₂O

4 / 15

Identify the reducing agent in the following reactions: Fe₂O₃ + 3CO → 2Fe + 3CO₂

CO

Fe

CO₂

Fe₂O

5 / 15

Identify the reducing agent in the following reactions: 2H₂ + O₂ → 2H₂O

O

H2

H2O

H2

6 / 15

Mention whether it is a physical or chemical changes: -Evaporation of petrol

physical

chemical

Both 1 & 2

none of these

7 / 15

Mention whether it is physical or chemical changes: Sublimation of solid ammonium chloride

physical

chemical

Both 1 & 2

none of these

8 / 15

In the electrolysis of water, name the gases liberated at cathode

Hydrogen

H₂O

Oxygen

both 1 & 3

9 / 15

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

10 / 15

Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be designated as:

displacement and redox

decomposition and redox

displacement and endothermic

decomposition and exothermic.

11 / 15

Which of the following reactions is an endothermic reaction?

Burning of coal.

Decomposition of vegetable matter into compost

Process of respiration.

Decomposition of calcium carbonate to form quick lime and carbon dioxide

12 / 15

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

13 / 15

Three beakers labelled as A, B and C, each containing 25 ml of water, were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in the case of beaker C, the temperature of the solution fell. Which one of the following statement(s) is (are) correct?

In beakers A and B, exothermic process has occurred.

In beakers A and B, endothermic process has occurred

In beaker C, exothermic process has occurred

In beaker C, endothermic process has occurred.

1

2

1 and 4

2 and 3

14 / 15

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

15 / 15

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?

Displacement reaction

Precipitation reaction

Combination reaction

Double displacement reaction

1

2

4

2 and 4

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Science : Ch 01 – Chemical Reactions and Equations

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