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Modern Periodic Table

Gypsum on hea...

Question

Gypsum on heating to $300^{o} C$ gives:

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

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C a S O_{4}

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C a S O_{4} . \frac{1}{2} H_{2} O

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S O_{3}

ans

C a O

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Solution

The correct option is C $C a S O_{4} . \frac{1}{2} H_{2} O$
Here answer is option C
Gypsum- chemical formula ; $C a {S O}_{4} \cdot 2 H_{2} O$
When gypsum is heated at 300K, we get plaster of paris(calcium sulphate hemihydrated salt)
$C a {S O}_{4} \cdot 2 H_{2} O \to C a {S O}_{4} \frac{1}{2} H_{2} O + \frac{3}{2} H_{2} O$
Hence calcium sulphate Hemihydrated salt $C a {S O}_{4} \frac{1}{2} H_{2} O$ is produced after heating gypsum.

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C a S O_{4}

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