Question

The percentage content of water and calcium sulphate in gypsum is _______ and _______ respectively.

(a) 20.9, 79.1

(b) 15.4, 84.6

(c) 30.7, 69.3

(d) 55.3, 44.7

This question was addressed to me during an interview.

I'm obligated to ask this question of Miscellaneous Materials topic in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

Answer 1

Correct option is (a) 20.9, 79.1

For explanation I would say: Gypsum is the hydrated sulphate of calcium and is a white crystalline substance. The percentage content of water and calcium sulphate in gypsum is 20.9 and 79.1 respectively.