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Problem
Plaster of Paris is : a.
CaSO
4
\text{CaSO}_4
CaSO
4
b.
CaSO
4
⋅
7
H
2
O
\text{CaSO}_4 \cdot 7\text{H}_2\text{O}
CaSO
4
⋅
7
H
2
O
c.
2
CaSO
4
⋅
H
2
O
2\text{CaSO}_4 \cdot \text{H}_2\text{O}
2
CaSO
4
⋅
H
2
O
d.
CaSO
4
⋅
2
H
2
O
\text{CaSO}_4 \cdot 2\text{H}_2\text{O}
CaSO
4
⋅
2
H
2
O
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