Crystals and Crystallization

Q. (b) How can the impurities present in common salt be removed?

Q.

A good method to separate alum (phitkari) from impure samples is:

1. Filtration

2. Sedimentation

3. Crystallization

4. Sublimation

Q. In solid $C{u}_5{O}_4\cdot 5H_{2}O$, copper is coordinated to number of water molecules equal to :

1. $4$
2. $1$
3. $2$
4. $5$