A sulphate salt is a white, soft substance, which can be moulded into different shapes by
making its dough. When this compound is left in open for sometime, it becomes a solid mass
and cannot be used for moulding purposes. Identify the sulphate salt. Why does it show such
a behaviour? Give the reaction involved.
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Answer:
Calcium sulphate is a white soft substance. It is known as Plaster of Paris, which can be moulded into different shapes by making its dough. When Plaster of Paris is left for some time in open, it turns into solid mass because of reaction with moisture present in the atmosphere.
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