Test: Methods of Purification of Organic Compounds (NCERT) - NEET MCQ

Densities

Solubility

Melting points

Boiling points

Steam volatile and insoluble in water

Steam volatile and soluble In water

Steam volatile and sparingly soluble in water

In liquid form In steam and solid form In water

Vacuum distillation

Simple distillation

Steam distillation

Fractional distillation

Have very low boiling points

Are volatile

Have high boiling points and which decompose below their boiling points

Have a large difference In their boiling points.

Sublimation

Chemical methods

Crystallisation  

Extractioh with solvent

The organic substance is more soluble in the organic solvent

Organic compound being lighter moves in the upper layer

Organic solvent is insoluble in water hence organic compound moves up

From the supersaturated aqueous solution the solute starts diffusing.

Na₂O

Na₂SO₄

AI₂O₃

NaCl

A is the most weakly adsorbed component hence remains near the top

A is the most strongly adsorbed component hence remains near the top

C is the most strongly adsorbed component hence is found near the bottom

B is the most strongly adsorbed component hence is found in the centre of the column

xz,yz

(A) → (iii), (B) → (ii), (C) → (i), (D) → (iv)

(A) → (ii), (B) → (iii), (C) → (i), (D) → (iv)

(A) → (ii), (B) → (i), (C) → (iv), (D) → (iii)

(A) → (i), (B) → (iii), (C) → (ii), (D) → (iv)