Assertion : Crystals of hydrated calcium sulphate gypsure `(CaSO_(4).2H_(2)O)` are soft easilly eleaved.
Reason :Crystals anldrous calcium sulphate (anydride: `CaSO_(4))` are hard and very difficult to cleave.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true and the reason is 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

b

Explanation

Within the `Ca^(2+),SO_(4)^(2-)` layers the ions are hold togather by atrong electrovalent bonds but these separated `Ca^(2)//SO_(4)^(2-)` layers are linked by relative weak H- bond The weak H-bonds `SO_(4)^(2-)` ions is the intermediate region consequenity, the hypsum can be readily eleaved and structure along the layer of water molecules .Anlydride has a complrtly ionic structure involvin g only `Ca^(2+)` and `SO_(4)^(2-)` ions.