Which of the following is commonly known as gypsum?

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

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M g S O_{4} . 7 H_{2} O

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M g C l_{2} .7 H_{2} O

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C u S O_{4} .5 H_{2} O

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Solution

The correct option is A $C a S O_{4} . 2 H_{2} O$
Gypsum is a hard solid mass obtained by mixing Plaster of Paris with water. It has the chemical formula $C a S O_{4} .2 H_{2} O .$

Hence, the correct answer is option (a).

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