Properties Of Solids And Liquids Question 77

Question: The relative humidity on a day, when partial pressure of water vapour is $ 0.012\times 10^{5}Pa $ at 12°C is (take vapour pressure of water at this temperature as $ 0.016\times 10^{5}Pa $ ) [AIIMS 1998]

Options:

A) 70%

B) 40%

C) 75%

D) 25%

Show Answer

Answer:

Correct Answer: C

Solution:

Partial pressure of water vapour $ P _{W}=0.012\times 10^{5}Pa $ ,

Vapour pressure of water $ P _{V}=0.016\times 10^{5}Pa $ .

The relative humidity at a given temperature is given by $ =\frac{\text{Partial pressure of water vapour}}{\text{Vapour pressure of water}} $

$ =\frac{0.012\times 10^{5}}{0.016\times 10^{5}}=0.75=75% $



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