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

Identify the reducing agent in the following reactions: 2H₂O + 2F₂ → 4HF + O₂

H₂O

F₂

HF

O₂

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

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

Hydrogen

H₂O

Oxygen

both 1 & 3

7 / 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

8 / 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

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

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

11 / 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

12 / 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

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

Calcium oxide reacts vigorously with water to produce slaked lime. CaO(s) + H₂O(l) → Ca(OH)₂(aq) This reaction can be classified as:

Combination reaction

Exothermic reaction

Endothermic reaction

Oxidation reaction

1 and 3

3 and 4

1, 3 and 4

1 and 2

15 / 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

Your score is

0%

Science : Ch 01 – Chemical Reactions and Equations

Archives

Categories