Identify the type of reactions in each of the following reactions:
$(i)$ $Zn + H_{2}SO_{4} \longrightarrow ZnSO_{4} + H_{2}$
$(ii)$ $CaO + H_{2}O \longrightarrow Ca(OH)_{2}$

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
$(a)$ Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at $773 \ K$ to form ammonia gas.
$(b)$ Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

$A$ solution of potassium chloride when mixed with silver nitrate solution,an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction?

Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Write one example for each of the decomposition reactions carried out with the help of:
$(i)$ electricity
$(ii)$ heat
$(iii)$ sunlight
Give balanced chemical equations in each case.

Give differences between the displacement and double displacement reactions.