Name the technique for the separation of the following:
Copper sulphate crystals from its aqueous solution. (crystallisation/ winnowing/ distillation)

Which of the following are NOT correct methods for separating the components of given mixtures?

I. The mixture of Iodine and sodium chloride by sublimation.

II. Plant pigments by chromatography.

III. Mixture of acetic acid and water by separating funnel.

IV. Oxygen, argon and nitrogen from air by fractional distillation.

At a refinery, petroleum is separated into several components by a process called fractional distillation using a fractionating column. Which of the following statement is incorrect about the process?
(I) Temperature decreases from the bottom to the top of the column
(II) At each level in the column only one compound is collected
(III) The fraction collecting at the top of the column is less volatile
(IV) The fraction with the highest boiling point condenses first and gets collected near the base of the fractionating column.

Match the items in column A with the items in column B.

A solution of glucose in water is a homogeneous mixture.

Clean air is a _____ mixture.

A single substance of a definite composition is called a/an _____.