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Q)
Which is the molecular formula of gypsum ?
( A )
2
C
a
S
O
4
.
H
2
O
( B )
C
a
S
O
4
.3
H
2
O
( C )
C
a
S
O
4
.2
H
2
O
( D )
C
a
S
O
4
.
H
2
O
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