ଜିପସମର ରାସାୟନିକ ସୂତ୍ର ହେଉଛି ______ । 

1
CaSO 4 .12H 2 O
2
MgSO 4 .12H 2 O
3
MgSO 4 .2H 2 O
4
CaSO 4 .2H 2 O

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