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Dead burnt plaster is

Option 1)
$CaSO_{4}\cdot 2H_{2}O$

Option 2)
$2CaSO_{4}.H_{2}O$

Option 3)
$CaSO_{4}$

Option 4)
$CaSO_{4}.H_{2}O$

Answers (1)

best_answer

As we learnt in

Dead burnt plastic -

Gypsum when heated above 393K, no water of crystallisation is left and anhydrous $CaSO_{4}$ is formed

-

Plaster of Paris, the hemihydrate of Calcium Sulphate, when heated to a high temperature, loses all water of crystallization and the product is dead burnt plaster or CaSO_4.

Option 1)

$CaSO_{4}\cdot 2H_{2}O$

This option is incorrect.

Option 2)

$2CaSO_{4}.H_{2}O$

This option is incorrect.

Option 3)

$CaSO_{4}$

This option is correct.

Option 4)

$CaSO_{4}.H_{2}O$

This option is incorrect.

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prateek

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