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  4. The number of water molecules in gypsum, dead burnt plaster and plaster of paris, respectively are:

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Q. The number of water molecules in gypsum, dead burnt plaster and plaster of paris, respectively are:

JEE MainJEE Main 2021The s-Block Elements

Solution:

Gypsum $CaSO _{4} .2 H _{2} O$
Plaster of Paris $CaSO _{4} .\frac{1}{2} H _{2} O$
Dead burnt plaster $CaSO _{4}$