When powdered plaster of Paris is mixed with correct amount of water, it sets into a solid mass of

Question

When powdered plaster of Paris is mixed with correct amount of water, it sets into a solid mass of (A)  CaSO4 ⋅ 5H2O  (B)  CaS O4⋅ 3H2O  (C)  CaSO4⋅2H2O  (D)  CaSO4⋅1/2H2O

Tardigrade Admin · Accepted Answer

When powdered plaster of Paris mixed with water It takes up the water of crystallisation and forms a Plastic mass that gets converted into hard solid (gypsum) within

6

to

15 min

.

Plaster of Paris C a S O_{4} \cdot \frac{1}{2} H_{2} O H_{2} O (Setting) Orthorhombic C a S O_{4} \cdot 2 H_{2} O

Harderning Monoclinic (gypsum) C a S O_{4} \cdot 2 H_{2} O

Q. When powdered plaster of Paris is mixed with correct amount of water, it sets into a solid mass of

$C a S O_{4} \cdot 5 H_{2} O$

$C a S O_{4} \cdot 3 H_{2} O$

$C a S O_{4} \cdot 2 H_{2} O$

$C a S O_{4} \cdot 1/2 H_{2} O$

Q. When powdered plaster of Paris is mixed with correct amount of water, it sets into a solid mass of

CaSO4​⋅5H2​O

CaSO4​⋅3H2​O

CaSO4​⋅2H2​O

CaSO4​⋅1/2H2​O

$C a S O_{4} \cdot 5 H_{2} O$

$C a S O_{4} \cdot 3 H_{2} O$

$C a S O_{4} \cdot 2 H_{2} O$

$C a S O_{4} \cdot 1/2 H_{2} O$