When gypsum is heated to $393 \mathrm{~K}$, it forms :
Dead burnt plaster
Anhydrous $\mathrm{CaSO}_{4}$
$\mathrm{CaSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}$
$\mathrm{CaSO}_{4} \cdot 0.5 \mathrm{H}_{2} \mathrm{O}$
Correct Option: , 4
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