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An aqueous solution is 1.00 molal in Kl....

An aqueous solution is 1.00 molal in Kl. Which change will cause the vapour pressure of the solution to increase?

A

Addition of NaCl

B

Addition of `Na_2SO_4`

C

Addition of 1.00 molal KI

D

Addition of water

Text Solution

Verified by Experts

The correct Answer is:
D
Addition of water to an aqueous solution of KI causes the concentration of the solution to decrease thereby increasing the vapour pressure. In the other three options the electrolytes undergo ionisation, which leads to lowering of vapour pressure.
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Knowledge Check

  • An aqueous solution is 1 molal in KI. Which change will cause the vapour pressure of the solution to increase ?

    A
    Addition of NaCl
    B
    Assition of `Na_(2)SO_(4)`
    C
    Addition of 1 molal KI
    D
    Addition of water

  • An aqueous solution of KI is 1.0 molal in KI. Which change will cause the vapour pressure of the solution to increases ?

    A
    Addition of NaCI
    B
    Addition of `Na_(2)SO_(4)`
    C
    Addition of 1.0 molaol KI
    D
    Addition of water

  • The vapour pressure of a solution increases when

    A
    The temperature is raised
    B
    the volume is increased
    C
    the number of moles of the solute is increased
    D
    the temperature is lowered
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