When gypsum is heated to 393 K},

Question:

When gypsum is heated to $393 \mathrm{~K}$, it forms:

  1. Anhydrous $\mathrm{CaSO}_{4}$

  2. $\mathrm{CaSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$

  3. $\mathrm{CaSO}_{4} \cdot 0.5 \mathrm{H}_{2} \mathrm{O}$

  4.  Dead burnt plaster

Correct Option: , 3

Solution:

Gypsum on heating to $393 \mathrm{~K}$ forms plaster of Paris.

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