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Question
Chemistry
The number of water molecules in gypsum and plaster of Paris respectively are
Q. The number of water molecules in gypsum and plaster of Paris respectively are
4113
220
Punjab PMET
Punjab PMET 1999
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A
1/2 and 2
B
2 and 1/2
C
2 and 1
D
5 and 2
Solution:
Molecular formula of gypsum and plaster of Paris is
C
a
S
O
4
2
H
2
O
and
C
a
S
O
4
.
2
1
H
2
O
. Therefore, number of water molecules in gypsum and plaster of Paris is
2
and
2
1
respectively.