Chemical reactions and equations

Magnesium ribbon is rubbed before burning because it has a coating of

• basic magnesium carbonate

• basic magnesium oxide

• basic magnesium sulphide

• basic magnesium chloride

Which of the following are exothermic processes?

• sublimation of camphor (crystals)

• Evaporation of water

• Reaction of water with quick lime

• Dilution of an acid

Which of the following is not 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)

Which option denotes a double displacement reaction?

• A + B + C

• A + B → C

• AC + BD → AD + BC

• AC + B → AB + C

Which of the following is Not True with respect to the neutralisation reaction?

• Salt is formed.

• Reaction occurs between an acid and a base

• Reactive element displaces less reactive element.

• Reactants are in gaseous state.

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

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the type of the reaction involved?

Respiration is an ………….. reaction.

The oxidation and reduction reaction are also called ………….. reactions.

It is necessary to balance a chemical equation in order to satisfy the law of

• Conservation of motion

• Conservation of momentum

• Conservation of energy

• Conservation of mass