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 type of reaction is represented by: A + BC → AC + B ?

oxidation reaction

replacement reaction

displacement reaction

none of these

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: Fe₂O₃ + 3CO → 2Fe + 3CO₂

CO

Fe

CO₂

Fe₂O

4 / 15

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Why does the colour of the solution fades?

due to its reaction with hydrogen sulphide gas and results into the formation of colourless solution of sulphuric acid.

due to its reaction with Copper sulphate gas and results into the formation of colourless solution of sulphuric acid.

Both 1 & 2

all of these

5 / 15

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Write the chemical name of the black precipitate formed.

hydrogen sulphide

copper sulphide.

hydrogen sulphate

none of these

6 / 15

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

physical

chemical

Both 1 & 2

none of these

7 / 15

State the reactions exothermic or endothermic in nature: Dilution of sulphuric acid

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

8 / 15

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

endothermic reaction

both 1 & 3

exothermic reaction

all of these

9 / 15

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

10 / 15

Which of the following is not a physical change?

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefed Petroleum Gas

11 / 15

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

12 / 15

Which of the subsequent does show an oxidation reaction

Gain of oxygen

Loss of oxygen

Gain of hydrogen

None of the above

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

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

15 / 15

Which of the following are combination reactions?

KClO₃ →^(Heat)→ 2KCl + 3O₂

MgO + H₂O → Mg(OH)₂

4Al + 3O₂ → 2Al2O₃

Zn + FeSO₄ →ZnSO₄ + Fe

1 and 4

3 and 4

2 and 4

2 and 3

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Science : Ch 01 – Chemical Reactions and Equations

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