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NEET levelSingle correct optionDifficulty 1 of 3sb174

When plaster of Paris is mixed with water in the right amount, it sets to a hard mass of

A $Ca (OH) X_{2}$
B $CaSO X_{4} \cdot 2 H X_{2} O$
C $CaCO X_{3}$
D $CaSO X_{4}$

Answer: B

Plaster of Paris takes up water and recrystallises as gypsum:

(CaSO X_{4}) X_{2} \cdot H X_{2} O + 3 H X_{2} O 2 CaSO X_{4} \cdot 2 H X_{2} O

. The interlocking gypsum crystals give the hard mass.

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