Q. The chemical which is used for plastering the broken bones is
A) $\left( CaSO_{4} \right)_{2}\ .\ H_{2}O$
B) $MgSO_{4}\ .\ 7H_{2}O$
C) $FeSO_{4}\ .\ 7H_{2}O$
D) $CuSO_{4}\ \ .\ \ 5H_{2}\ O$
Explanation
(a)
$\left( CaSO_{4} \right)_{2}\ .\ H_{2}O\$ is plaster of Paris. Since, on adding water, it sets into a hard mass due to the formation of gypsum, it is used for plastering the broken bones.
$\left( CaSO_{4} \right)_{2}\ .\ H_{2}O + 1\frac{1}{2}H_{2}O\ \longrightarrow 2CaSO_{4}\ .\ 2H_{2}O$
hard mass
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.