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Standard XII
Chemistry
Elevation in Boiling Point
Question

Assertion :Addition of a non-volatile solute to a volatile solvent increases the boiling point. Reason: Addition of non-volatile solute results in lowering of vapour pressure.
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  3. Assertion is correct but Reason is incorrect
  4. Both Assertion and Reason are incorrect

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Both Assertion and Reason are incorrect
D
Assertion is correct but Reason is incorrect
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Solution
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When a solute is added to a solvent, the vapour pressure of the solvent (above the resulting solution) is lower than the vapour pressure above the pure solvent and addition of a non-volatile solute to a volatile solvent increase the boiling point this principle is known as boiling point elevation.

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Assertion :Addition of a non-volatile solute to a volatile solvent increases the boiling point. Reason: Addition of non-volatile solute results in lowering of vapour pressure.
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