Gypsum contains

A. 18.6% Ca and 29.2% S

B. 29.2% Ca and 18.6% S

C. 19.5% Ca and 12.5% S

D. 12.5% Ca and 18.6%

Answer: Option B

Solution(By Examveda Team)

Gypsum contains 29.2% Ca and 18.6% S.
Gypsum is a soft sulphate mineral composed of calcium sulphate dehydrate, with the chemical formula CaSO₄·2H₂O. Gypsum provides two of the secondary plant macronutrients, calcium and sulphur.
Gypsum is also formed as a by-product of sulphide oxidation, amongst others by pyrite oxidation, when the sulfuric acid generated reacts with calcium carbonate. Its presence indicates oxidizing conditions.