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The relative humidity on a day, when par...

The relative humidity on a day, when partial pressure of water vapour is `0.012xx10^(5)` Pa at `12^(@)C` is (take vapour pressure of water at this temperature as `0.016xx10^(5)` Pa)

A

`70%`

B

`40%`

C

`75%`

D

`25%`

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The correct Answer is:
C
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4.375 g of a substance when dissolved in 36.0 g of water, lowered its vapour pressure by 0.5 mm at a given temperature. The vapour pressure of water at this temperature is 25.0 mm . Calculate the molecular weight of solute.

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