Q106 / 270 · NDA 2018 (Phase 2) · General Ability

Which one of the following is the chemical formula of gypsum?

Correct answer
A
$\mathrm{CaSO}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$
B
$\mathrm{Ca}_2 \mathrm{SiO}_4$
C
$2 \mathrm{CaSO}_4 \cdot \mathrm{H}_2 \mathrm{O}$
D
$\mathrm{CaSO}_4$

Solution

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula $\mathrm{CaSO}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard chalk and wallboard.

Hence, the correct answer is option: 'A'.

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