Chemical reactions and equations Quiz 1

The removal of oxygen from a substance is called

• oxidation

• reduction

• corrosion

• redox

The chemical equations are balanced to satisfy one of the following laws in chemical reaction. This law is known as:

• law of conservation of momentum

• law of conservation of mass

• law of conservation of motion

• law of conservation of magnetism

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 Liquefied Petroleum Gas (LPG)

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

• 1:1

• 1:2

• 2:1

• 3:1

This reaction represents

• Combination reaction

• Displacement reaction

• Double displacement reaction

• Decomposition reaction

Which one of the following processes involve chemical reactions?

• Storing of oxygen gas under pressure in a gas cylinder

• Liquefaction of air

• Keeping petrol in a china dish in the open

• Heating copper wire in presence of air at high temperature

Identify the type of chemical reaction.

Identify the following:

A) The substance which is oxidised

B) The substance which is reduced

C) Reducing agent

D) Oxidising agent

Define oxidation.

Photosynthesis is a type of endothermic reaction. Justify