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 773K to form ammonia gas.
(b) Limestone is heated strongly to form quicklime and carbon dioxide gas is evolved
(a) N2 + 3H2 + Catalyst/773 K → 2NH3
It is a combination reaction as two or more reactants combine to form a single product.
(b) CaCO₃ + Heat → CaO+CO₂(g)↑
It is a decomposition reaction as a single reactant is broken down to two or more products.