Given below are two statements : Statement I : Sublimation is used for the separation and purification of compounds with low melting point. Statement II : The boiling point of a liquid increases as the external pressure is reduced. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement I : Sublimation is used for the separation and purification of compounds with low melting point. Statement II : The boiling point of a liquid increases as the external pressure is reduced.

Q. Given below are two statements :

Statement I : Sublimation is used for the separation and purification of compounds with low melting point.

Statement II : The boiling point of a liquid increases as the external pressure is reduced.

In the light of the above statements, choose the correct answer from the options given below :

A. Both Statement I and Statement II are false

B. Statement I is true but Statement II is false

C. Both Statement I and Statement II are true

D. Statement I is false but Statement II is true

Correct Answer: Both Statement I and Statement II are false

Explanation

Statement I is false. Sublimation is used for the separation and purification of compounds that sublime on heating, such as ammonium chloride, naphthalene and iodine. Sublimable substances generally have low intermolecular forces, not necessarily low melting points. Hence, linking sublimation directly with low melting point is incorrect.

Statement II is also false. The boiling point of a liquid decreases when the external pressure is reduced. This is because boiling occurs when vapour pressure of the liquid equals the external pressure. At lower pressure, this condition is achieved at a lower temperature.

Therefore, both Statement I and Statement II are false.

Explanation

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