Setting of plaster of paris is

Oxidation with atmospheric oxygen

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Combination with atmospheric CO₂

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Dehydration

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Hydration to yield another hydrate

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Solution

The correct option is D
Hydration to yield another hydrate

Setting of plaster of paris is exothermic process

$C a S O_{4} . \frac{1}{2} H_{2} O H_{2} O - -- \to C a S O_{4} .2 H_{2} O H a r d e n i n g - ------- \to C a S O_{4} .2 H_{2} O$

Orthorhombic Monoorthorhombic Gypsum

The setting is due to formation of another hydrate

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An ionic compound that attracts atmospheric water so strongly that a hydrate is formed is said to be:

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