Assertion : `CuSO_(4).5H_(2)O` on heating to `250^(@)C` losses all the five `H_(2) O` molecules and becomes anhydrous.
Reason : All five `H_(2) O` molecules are coordinated to the central `Cu^(2+)` ion.

Options

A. If both assetion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are ture but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

C

Explanation

Assertion: `CuSO_(4). 5H_(2) O overset(250^(@)C)rarr CuSO_(4)` (white) `+ 5H_(2)O`. Anhydrous copper sulphate becomes white because there is no d-d transition of electron in absence of ligands according to crystal field theory.
Reason: Four water molecules are coordinated to `Cu^(2+)` and fifth one is hydrogen bonded to two water molecules and anion, `SO_(4)^(2-)`