Question

Magnesium perchlorate is an excellent drying agent why

Answer 1

Magnesium perchlorate is a powerful oxidizing agent, with the formula Mg(ClO4)2. It is also a superior drying agent for gas analysis. Magnesium perchlorate decomposes at 250 °C.

Answer 2

Drying agents are a type of chemical substances which absorbs the moisture from it's surrounding's environment.Basically hygroscopic substances are known as the drying agents.

Similarly magnesium perchlorate is also a hygroscopic substance which heavily absorbs the moisture from it's surrounding's environment and dissolves the water in itself.