10 lits of an air sample with relative humidity 0.6 is compressed to 5 litres at same temperature. What is the partial pressure of the water vapour in the compressed air, if the pressure of saturated water vapour at that temperature is 2.4 K Pa

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1.2 KPa

2.4 Kpa

1.8 KPa

3.6 KPa

answer is B.

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Detailed Solution

$\begin{array}{l} R . H . = 0.6 = \frac{P_{H_{2} O}}{V . P} \times 100 \\ \Rightarrow P_{H_{2} O} = 0.6 \times 2.4 = 1.44 kPa \end{array}$

on making volume half, $P_{H_{2} O}$ should double,

$\Rightarrow P_{H_{2} O} = 2.4 kPa$ (limiting value)

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