Answer:
Chemical weathering is a process of weathering which involves the break down of rocks into smaller parts and sediments by the action of a chemical agent. It results in the change of the chemical composition of a weathered material from the parent rock. The chemical weathering causes disintegration of rocks by chemical reactions. These chemical reactions includes hydrolysis, carbonation and oxidation. These reactions affects the mineral composition present in the rocks.
Oxidation is a chemical weathering process. Oxidation is a chemical reaction in which rock minerals reacts with oxygen in the air. It results in oxidation of minerals. When minerals gets oxidized, the chemical bonds among the inorganic mineral elements becomes weak. This results in the weakening of the overall physical structure of rock. This causes weathering of the rocks.
Example iron present in the rocks, when gets oxidized forms iron oxide. This results in formation of brownish red layer of iron oxide over the surface of iron. This phenomena is known as rusting. Rusting weaken the structure of iron, causes weathering.