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A suphlate slat of goup 2 elemne t of t...

A suphlate slat of goup 2 elemne t of the periodic tables is a swhite soft substance which can be moluded in to different shapes by making its dough. When this compound is left in open for some time, it becomes a solid masss and cannot be used for moudling purposes . Identify the suphates salt and why does it show such a behavuiour ? Gove the reaction involved .

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The available information suggests that the element present in group 2 of the Periodic Table is calcium (Ca) and the sulphate slat (white in colour) is Plaster of Paris. It can be moulded into different shapes by making its dough with water. When left in the open, Plaster of Paris changes into Gypsum which is a solid mass quite hard in nature and can no longer be used for moulding.
`underset ("Plaster of Paris")(CaSo_(4))1//2H _(2)O + underset("Moisture")(3//2H_(2)O) to underset("Gypsum")(CaSO_(4).2H_(2)O)`
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