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JIPMER 2018

Exam: JIPMER
Year: 2018
Subject: Chemistry
Chapter: s Block Elements

JIPMER 2018 · Chemistry · s Block Elements

The correct formula for plaster of Paris is

The correct formula for plaster of Paris is

Options

A $\mathrm{CaSO}_4 \cdot 4 \mathrm{H}_2 \mathrm{O}$
B $\mathrm{CaSO}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$
C $\mathrm{CaSO}_4 \cdot \frac{1}{2} \mathrm{H}_2 \mathrm{O}$
D $\mathrm{CaSO}_4 \cdot 1 \mathrm{H}_2 \mathrm{O}$

Correct answer

C. $\mathrm{CaSO}_4 \cdot \frac{1}{2} \mathrm{H}_2 \mathrm{O}$

Step-by-step solution

Plaster of Paris (POP) is a hemihydrate of calcium sulphate. Its chemical formula is

\mathrm{CaSO}_4 \cdot \frac{1}{2} \mathrm{H}_2 \mathrm{O}\left[\mathrm{or}\left(\mathrm{CaSO}_4\right)_2 \cdot \mathrm{H}_2 \mathrm{O}\right]

.

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