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Which of the following facts about gypsum is not correct?

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Which of the following facts about gypsum is not correct?

(a) It is hydrated sulphate of calcium

(b) It has excellent solubility in water

(c) It is white in the pure state

(d) Its solubility in water is extremely poor

I had been asked this question in an interview.

My question is taken from Stones in chapter Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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Correct choice is (b) It has excellent solubility in water

Easy explanation: Gypsum is hydrated sulphate of calcium. It is white in the pure state. Its solubility in water is extremely poor.

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