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Assertion : When NaCl is added to water ...

Assertion : When NaCl is added to water a depression in freezing point is observed.
Reason : The lowering of vapour pressure of a solution causes depression in the freezing point.

A

Assertion and reason both are correct statements and reason is correct explanation for assertion.

B

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C

Assertion is correct statement but reason is wrong statement.

D

Assertion and reason both are incorrect statements.

Text Solution

Verified by Experts

The correct Answer is:
A
Explanation : On addition of nonvolatile solute (viz. NaCl)to water NACl solution is formed. Due to relatively lesser number of water molecules at the surface of liquid, the solution exerts a lower vapour pressure as compared to that of pure water. It is because of this lowering of vapour pressure that a depression in freezing point of water is observed.
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Knowledge Check

  • ……… solution has highest freezing point.

    A
    `1 m K_(4)[Fe(CN)_(6)]`
    B
    1 m NaCl
    C
    1 m glucose
    D
    1 m KCl

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

    A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
    B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
    C
    Assertion is correct statement but reason is wrong statement.
    D
    Assertion and reason both are incorrect statements.

  • Which equimolal concentrated solution has highest freezing point ?

    A
    Glucose
    B
    `La(NO_(3))_(3)`
    C
    `Ca(NO_(3))_(2)`
    D
    Vinegar

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