$C a S O_{4} .2 H_{2} O$ is :

Gypsum

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Anhydrite

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Alabaster

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Plaster of paris

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Solution

The correct option is B Gypsum
$C a S O_{4} .2 H_{2} O$ is the chemical formula of gypsum.

It is a soft sulphate mineral composed of calcium sulphate dihydrate.
It is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall.

Hence, option $A$ is correct.

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Find the number of moles of $C a S O_{4} .2 H_{2} O$ present in $3.011 \times 10^{24}$ formula units of $C a S O_{4} .2 H_{2} O$

C a S O_{4} .2 H_{2} O

(a) What is plaster of Paris? Write the chemical formula of plaster of Paris.

(b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved.

(d) State two important uses of plaster of Paris.

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