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

Which reaction takes place when layer of silver deposit on copper wire when dipped in silver nitrate solution?

displacement reaction

replacement reaction

oxidation

reduction reaction

2 / 15

Give an example of decomposition reaction taking place in our body.

reproduction

digestion

blood circulation

respiration

3 / 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.Name the type of reaction taking place.

double displacement reaction

single displacement reaction

double replacement reaction

all of these

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

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

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

7 / 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

8 / 15

State the reactions are exothermic or endothermic in nature: Dissolution of ammonium chloride in water

exothermic reaction

endothermic reaction

Both 1 & 2

none of these

9 / 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

10 / 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

11 / 15

When hydrogen sulphide gas is passed through a blue solution of copper sulphate a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remain in the solution. The reaction is an example of a:

Combination reaction

Displacement reaction

Decomposition reaction

Double displacement reaction

12 / 15

which of the subsequent chemical equations do the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

2H₂(l) + O₂(l) → 2H₂O(g)

2H₂(g) + O₂(l) → 2H₂O(g)

2H₂(g) + O₂(g) → 2H₂O(l)

2H₂(g) + O₂(g) → 2H₂O(g)

13 / 15

One of the following does not happen during a chemical reaction.

Breaking of old chemical bonds and formation of new chemical bonds

Formation of new substances with entirely diferent properties

Atoms of one element change into those of another element to form new products

A rearrangement of atoms takes place to form new products

14 / 15

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

15 / 15

The following reaction is an example of a: 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Displacement reaction

Combination reaction

Redox reaction

Neutralisation reaction

1 and 4

2 and 3

1 and 3

3 and 4

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Science : Ch 01 – Chemical Reactions and Equations

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