When gypsum is heated to

Question:

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

  1. Dead burnt plaster

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

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

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

Correct Option: , 4

Solution:

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