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  4. Gypsum on heating above 437 K gives

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Q. Gypsum on heating above 437 K gives

NTA AbhyasNTA Abhyas 2022

Solution:

Gypsum on heating above 437 K gives anhydrous calcium sulphate as follows
$CaSO_{4}.2H_{2}O\overset{390 K}{ \rightarrow }CaSO_{4}.5H_{2}O\overset{A b o v e}{ \rightarrow }CaSO_{4}$