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Which of the following changes decrease ...

Which of the following changes decrease the vapour pressure of water kept in a sealed vessel? Decreasing the quantity of water Adding salt to water Decreasing the volume of the vessel to one-half Decreasing the temperature of water

A

Decreasing the quantity of water

B

Adding salt to water

C

Decreasing the volume of the vessel to one-half

D

Decreasing the temperature of water

Text Solution

Verified by Experts

The correct Answer is:
B, D
When salt is added , less surface area is available for the solvent to vaporise and hence , solvent experience less pressure by vapours . Thus , vapour pressure decreases . Moreover , vapour pressure also decrease with decrease in temperature because kinetic energy of the molecules decreases .
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Knowledge Check

  • Which one of the following processes will produce hard water?

    A
    Addition of 'Na_2 SO_4' to water
    B
    Saturation of watèr with 'CaCO_3'
    C
    Saturation of water with 'MgCO_3'
    D
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  • In which of the following substances does resistance decrease with increase in temperatures ?

    A
    Copper
    B
    Carbon
    C
    Constantan
    D
    Silver

  • Which one is a unit of measurement of water potential/osmotic pressure?

    A
    Kelvin
    B
    Joule
    C
    Pascal
    D
    Litre

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