A mixture containing ${\mathrm{SiO}}_2$, $\mathrm{NaCl}$ and ${\mathrm{NH}}_4\mathrm{Cl}$ is taken for separating the constituents. The suitable steps required for this are-

Steam distillation is used to separate-

Choose the correct statements using the codes given below:

I. Impure glycerine is purified by vacuum distillation.
II. Glycerine dissolves in water.
III. Water is a homogeneous mixture of hydrogen and oxygen.