S Block Elements Question 173

Question: Plaster of paris hardens by

[CPMT 1994]

Options:

A) Giving off $ CO_2 $

B) Changing into $ CaCO_3 $

C) Uniting with water

D) Giving out water

Show Answer

Answer:

Correct Answer: C

Solution:

$ \underset{\text{Plaster of paris}}{\mathop{CaSO_4.\frac{1}{2}H_2O}}+\frac{1}{2}H_2O\to \underset{\text{Hard mass}}{\mathop{CaSO_4.2H_2O}} $

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