Name a suitable technique of separation of the components from a mixture of calcium sulphate and camphor.

Which of the following sets of components form a homogeneous mixture?

Which of the following undergoes sublimation?

Given below are two statements:
Statement $I :$ $A$ mixture of chloroform and aniline can be separated by simple distillation.
Statement $II :$ When separating aniline from a mixture of aniline and water by steam distillation,aniline boils below its boiling point.
In the light of the above statements,choose the most appropriate answer from the options given below.

The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front,substance $A$ and substance $B$ from the base line are $3.25 \ cm$,$2.08 \ cm$ and $1.05 \ cm$ respectively. The ratio of $R_{f}$ values of $A$ to $B$ is $.........$

One sample of atmospheric air is found to have $0.03\%$ of carbon dioxide and another sample $0.04\%$. This is evidence that