Electric water purifier works on the principle of ____.

Given below are two statements:
Statement-I: Retardation factor $\left({\mathrm{R}}_{\mathrm{f}}\right)$ can be measured in meter/centimetre.

Statement-II: ${\mathrm{R}}_{\mathrm{f}}$ value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below:

Using the provided information in the following paper chromatogram:

The calculated ${\mathrm{R}}_{\mathrm{f}}$ value of $\mathrm{A} \mathrm{is} \mathrm{\_\_\_\_\_}\times {10}^{-1}$.

Why can sugar not be separated from water by evaporation? 

(Hint: Sugar will get charred if the solution is heated excessively). 

Fill in the blank space by choosing correct words from the list given below . 
List : evaporation, churning, threshing, sieving, sedimentation, winnowing, condensation, hand-picking. 

Corn is separated from husk by the process of _____.

Squeeze some drops of lime into a glass of milk. You will see a whitish solid forming after some time. Place a thin cloth over a bowl and pour the liquid on it. The white solid is left behind on the cloth and liquid collects in the bowl.

_____ is the name of the process represented by pouring the liquid through a cloth. (distillation/filtration/chromatography)

Squeeze some drops of lime into a glass of milk. You will see a whitish solid forming after some time. Place a thin cloth over a bowl and pour the liquid on it. The white solid is left behind on the cloth and liquid collects in the bowl. What is the correct name for the liquid that collects in the bowl?

Squeeze some drops of lime into a glass of milk. You will see a whitish solid forming after some time. Place a thin cloth over a bowl and pour the liquid on it. The white solid is left behind on the cloth and liquid collects in the bowl.

_____ is the process represented by adding lime to milk.

Name the following:
The process of pouring out the liquid without disturbing the sediments.

Match the statements in the column A with those in column B.