Organic Chemistry : Some Basic Principles & Techniques Test

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Organic Chemistry : Some Basic Principles & Techniques Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

Separation of two substances by crystallisation depends upon their differences In

A
Densities

B
Solubility

C
Melting points

D
Boiling points

Solution

Crystallisation is based on the difference in the solubilities of the compound and the impurities in a suitable solvent.
Question 2
4 / -1

Those substances can be separated by steam distillation which are

A
Steam volatile and insoluble in water

B
Steam volatile and soluble In water

C
Steam volatile and sparingly soluble in water

D
In liquid form In steam and solid form In water

Solution

Steam distillation is applied to separate substances which are steam volatile and are immiscible in water.
Question 3
4 / -1

Glycerin can be purified by:

A
Vacuum distillation

B
Simple distillation

C
Steam distillation

D
Fractional distillation

Solution

The liquids which decompose at its boiling point can be purified by vacuum distillation. Glycerol decomposes at its boiling point (563K). It can be distilled by vacuum distillation without decomposition at 453K and under 12mm Hg pressure.
Question 4
4 / -1

Distillation under reduced pressure Is generally used to purify those liquids which

A
Have very low boiling points

B
Are volatile

C
Have high boiling points and which decompose below their boiling points

D
Have a large difference In their boiling points.

Solution

Compounds which dissociate below thenboiling points or which have very high boiling points are distilled under reduced pressure.
Question 5
4 / -1

Which method can be applied to separate a mixture of camphor and benzole add?,

A
Sublimation

B
Chemical methods

C
Crystallisation

D
Extractioh with solvent

Solution

Since both benzoic acid and camphor sublimate they can be separated by chemical methods. Benzoic acid reacts with alkalies whereas camphor does not.
Question 6
4 / -1

The process of separation of an organic compound from its aqueous solution by shaking with a suitable solvent is termed solvent extraction or differential extraction.

The organic compound present in the aqueous layer moves to the organic solvent because

A
The organic substance is more soluble in the organic solvent

B
Organic compound being lighter moves in the upper layer

C
Organic solvent is insoluble in water hence organic compound moves up

D
From the supersaturated aqueous solution the solute starts diffusing.

Solution

The organic substance being more soluble in organic solvent is transferred from aqueous layer to the organic layer.
Question 7
4 / -1

The substance which can be used as adsorbent in column chromatography is

A
Na₂O

B
Na₂SO₄

C
AI₂O₃

D
NaCl

Solution

Alumina or silica gel are generally used as adsorbent in column chromatography.
Question 8
4 / -1

Given below is the column of adsorbent in which the mixture of the compounds A + B + C is placed. When the solvent is poured through the column, the components are separated depending upon the degree of adsorption. Which of the given statements is correct?

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

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

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

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

Solution

The most strongly adsorbed component is present in the band near the top while the weakly adsorbed constituent is found near the bottom.
Question 9
4 / -1

Given below is the developed chromatogram of a mixture of pigments.

R_f values for x and y can be expressed as

A

B

C
xz,yz

D

Solution
Question 10
4 / -1

Few mixtures and their methods of separation are given in the columns I and II respectively. Match the columns and mark the appropriate choice.

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

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

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

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