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Question
Assertion: When methyl alcohol is added to water, the boiling point of water increases.
Reason: When a volatile solute is added to a volatile solvent elevation in boiling point is observed.
Options
Assertion and reason both are correct statements and reason is the correct explanation for assertion.
Assertion and reason both are correct statements but the reason is not the correct explanation for assertion.
Assertion is a correct statement but the reason is the wrong statement.
Assertion and reason both are incorrect statements.
Assertion is a wrong statement but the reason is the correct statement.
Solution
Assertion and reason both are incorrect statements.
Explanation:
(i) 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 decreases.
(ii) When methyl alcohol is added to water A-B interaction < A-A or B-B interaction that is why it will show positive deviation from Raoult's law. Since a positive deviation from Rault's law indicates a rise in vapour pressure the boiling point decreases.
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