`CuSO_(4).5H_(2)O`, a hydrated salt, is a coordination compound of `Cu^(2+)` ions with `H_(2)O` molecules as the ligands. It can also be regarded as a solution of

Options

A. a solid in a liquid
B. a liquid in a solid
C. a solid in a solid
D. a liquid in a liquid

Answer

2

Explanation

Because its composition changes on heating unlike a compound.

These changes are reversible, the colourless anhydrous salt turning blue on contact with water to form crystal of blue vitriol: `[Cu(H_(2)O)_(4)]^(2+) SO_(4)^(2-). H_(2)O`, four water molecular are coordinated to the central to the central metal ion `(Cu^(2+))` while the fifth water molecule is hydrogen bonded to sulphate ion.