Question

A Sulphate salt of group 2 element of the periodic table is a white ,soft substance ,which can be moulded into different shapes by making it's dough .when this compound is left in open for some time ,it becomes a solid mass and cannot be used for moulding purposes . Identify the Sulphate salt and why does it show such a behaviour .Give the reaction involved

Answer 1

HEY DEAR ...

As the Compound is from the element of Group 2 in periodic table. 
We can consider element as  Calcium and its salt as 
Calcium sulphate hemi hydrated salt .
Common Name : plaster Of paris
Formula : CaSO4.1/2H20
Chemical Name : calcium sulphate  hemi hydrated salt

Plaster of paris is used in making different Ganesh Idols and other decorative items.
But its very important that Plaster of pairs should be stored in Moisture proof container.
Because on exposure to moisture POP turns to hard solid mass called as Gypsum which cannot be used for molding Purpose.
CasO4.1/2H20 +3/2 H20 ---> CaSO4.2H2O
[POP]                                        [Gypsum]

HOPE , IT HELPS ...

Answer 2

HERE IS YOUR ANSWER MATE...............

As the Compound is from the element of Group 2 in periodic table.

We can consider element as Calcium and its salt as Calcium sulphate hemi hydrated sal .

Common Name: plaster of Paris Formula: CaSO4.1/2H20

Plaster of Paris is used in making different Ganesh idols and other decorative items. But its very

important that Plaster of pairs should be stored in Moisture proof container because on exposure to

moisture POP turns to hard solid mass called as Gypsum which cannot be used for molding Purpose.

CaSO4.1/2H20 +3/2 H20 → CaSO4.2H2O