(A) :When methanol is added to water boiling point of water decreases.
(R) :Methanol when added to water gives a non ideal solution with negative deviation.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is D.

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Detailed Solution

Elevation of boiling point refers to the fact that a solution's boiling point is higher than that of a pure solvent because a liquid's boiling point (that of a solvent) rises when a chemical is added to it. This happens when a non-volatile solute like salt is mixed with a pure solvent like water.

When methanol is added, water loses some of its boiling point. Due to a cooperative property with a higher boiling point, the solvent experiences an increase in vapour pressure when a more volatile solute is introduced
Hence, correct option is: (D) Both (A) and (R) are false

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