Test: Purification of Organic Compounds


10 Questions MCQ Test Topic-wise MCQ Tests for NEET | Test: Purification of Organic Compounds


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Attempt Test: Purification of Organic Compounds | 10 questions in 15 minutes | Mock test for NEET preparation | Free important questions MCQ to study Topic-wise MCQ Tests for NEET for NEET Exam | Download free PDF with solutions
QUESTION: 1

This apparatus provides many surfaces for heat exchange between the ascending vapours and the descending condensed liquid.

Solution:
QUESTION: 2

Paper chromatography is a type of:

Solution:

In partition chromatography, the stationary phase is thin film of liquid adsorbed on an essentially inert support. Mobile phase may be a liquid or a gas.
Paper chromatography is an example of partition chromatography in which liquid present in the pores of paper is stationary phase and some other liquid is movable phase. Separation depends upon partition of substance between two phases and the adsorption effects of inert support on compounds undergoing chromatographic separation.

QUESTION: 3

 How are essential oils purified?

Solution:

The correct answer is Option A.
 
Steam distillation is used to separate organic compounds that tend to decompose at high temperature. Essential oils can be purified by steam distillation.

QUESTION: 4

The process of separation of solid organic compounds is known as:

Solution:

The process by which an impure compound is converted into its crystals is known as crystallisation. It is based on the difference in the solubilities of the compound and the impurities in a suitable solvent.

QUESTION: 5

 Pick the odd one out:

Solution:
QUESTION: 6

Separation of mixture into a column of adsorbent is known as:

Solution:
QUESTION: 7

 Distance moved by the substance from the base line to the distance moved by the solvent from the base line is known as the:

Solution:

The Rf value is defined as the ratio of the distance moved by the solute and the distance moved by the the solvent along the paper, where both distances are measured from the common Origin or Application Baseline, that is the point where the sample is initially spotted on the paper.

QUESTION: 8

This method is used to purify liquids having very high boiling points and those, which decompose at or below their boiling points.

Solution:
QUESTION: 9

 Impure sample of Naphthalene can be purified by:

Solution:

Sublimation is a process of changing solid to gas and vice-versa. And when naphthalene changes into gas then impure substance would be left.

QUESTION: 10

Process of separation of mixtures into their components and to purify the compounds by using adsorption is known as:

Solution:

The correct answer is Option D.
Chromatography is an important separation technique used to separate constituent particles of a mixture of substances, to purify the compounds and check the purity of organic compounds. In this technique on a stationary phase (solid or a liquid) a mixture of substances is applied. The mixture of gas or the pure solvent is allowed to move slowly on the stationary phase. Due to which the components of the mixture start separating from one another.

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