Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	When methyl alcohol is added to water, boiling point of water increases.
Reason (R):	When a volatile solute is added to a volatile solvent, elevation in boiling point is observed.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

Hint: Volatile solutes make the solvent to evaporate at a lesser temperature

Methyl alcohol and water both are volatile liquids which when mixed together to form a binary solution, the vapour pressure of this solution becomes

more as compared to individual pure components. This affects the boiling point of water with a decrease.

Hence, when methyl alcohol added to the water the boiling point of the water decreases because easily volatile solutes make the solvent to evaporate at a lesser temperature when compared to normal solvent.

Hence, both Assertion and Reason is wrong statements.

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