Statement-I : When methyl alcohol is added towater, boiling point of water increases.Statement-II : When a volatile solute is addedto a volatile solvent elevation in boiling point isalways observed.(1) Both Statement-I and statement-II are true(2) Statement-I is true and statement-II is false(3) Statement-I is false and statement-II is true(4) Both Statement-I and statement-II are false
Question
Statement-I : When methyl alcohol is added towater, boiling point of water increases.Statement-II : When a volatile solute is addedto a volatile solvent elevation in boiling point isalways observed.(1) Both Statement-I and statement-II are true(2) Statement-I is true and statement-II is false(3) Statement-I is false and statement-II is true(4) Both Statement-I and statement-II are false
Solution
Statement-I: When methyl alcohol is added to water, boiling point of water increases.
Statement-II: When a volatile solute is added to a volatile solvent, elevation in boiling point is always observed.
To determine the correctness of these statements, we need to analyze each statement separately.
Statement-I: When methyl alcohol is added to water, boiling point of water increases.
This statement is true. When a non-volatile solute, such as methyl alcohol, is added to a solvent, such as water, the boiling point of the solvent increases. This is due to the fact that the presence of the solute disrupts the intermolecular forces between the solvent molecules, making it more difficult for them to escape into the vapor phase. As a result, a higher temperature is required to reach the boiling point.
Statement-II: When a volatile solute is added to a volatile solvent, elevation in boiling point is always observed.
This statement is false. When a volatile solute is added to a volatile solvent, the boiling point of the solvent may or may not increase. The elevation in boiling point depends on the nature and concentration of the solute. In some cases, the presence of a volatile solute can actually lower the boiling point of the solvent, as it can disrupt the intermolecular forces and make it easier for the solvent molecules to escape into the vapor phase.
Therefore, the correct answer is:
(1) Both Statement-I and statement-II are true.
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