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

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.

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.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

4 / 15

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

physical

chemical

Both 1 & 2

none of these

5 / 15

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

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

6 / 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

7 / 15

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

H<sub>2</sub>O

Oxygen

Hydrogen

None of these

8 / 15

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Identify the brown gas X evolved.

X is nitrogen dioxide gas (NO<sub>2</sub>) that has evolved as brown, choking fumes

X is copper oxide gas that has evolved as brown, choking fumes

X is oxygen gas that has evolved as brown, choking fumes.

none of these

9 / 15

Solid calcium oxide reacts vigorously with water to form calcium hydroxide, accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form a solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

It is an endothermic reaction

It is an exothermic reaction.

The pH of the resulting solution will be more than seven.

The pH of the resulting solution will be less than seven

1 and 2

2 and 3

1 and 4

3 and 4

10 / 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

11 / 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.

12 / 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

13 / 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

14 / 15

Which of the subsequent does show an oxidation reaction

Gain of oxygen

Loss of oxygen

Gain of hydrogen

None of the above

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

Your score is

0%

Science : Ch 01 – Chemical Reactions and Equations

Archives

Categories