Chapter 18, Problem 40R

To determine

To Choose: The correct option.

Answer to Problem 40R

The correct option is (B).

Explanation of Solution

Introduction:

The anhydrous compounds are those which do not contain any water molecule in them.

${\text{CaSo}}_{\text{4}}$(Calcium sulfate) does not contain any water molecule in it, hence it is anhydrous compound.

Water in itself is hydrated and H₂O shows the presence of 1 molecule of water. Hence, it is a hydrated compound. Hence, the option (A) is not correct.${\text{CaSo}}_{\text{4}}.{\text{5H}}_{\text{2}}\text{O}$ (Copper sulfate pentahydrate ) contains five molecules of water in it. Hence the option (C) is not correct.

${\text{CaSo}}_{\text{4}}.2{\text{H}}_{\text{2}}\text{O}$ (Calcium sulfate dihydrate) contain two molecules of water in it, hence it is also a hydrated compound. Thus, the option (D) is not correct.

${\text{CaSo}}_{\text{4}}$ is an anhydrous compound and the rest are Hydrate compounds. Therefore, option (B) is correct.

Conclusion:

Hence, the anhydrous compound is ${\text{CaSo}}_{\text{4}}$ .