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Q.

The vapour pressure of water at 20°C is 17.54mm Hg. then the vapour pressure of the water in the apparatus after the piston is lowered, decreasing the volume of the gas above the liquid to one half of its initial volume (temperature constant) is

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a

8.77 mmHg

b

35.08 mm Hg

c

17.54 mm Hg

d

between 8.77 and 17.54 mmHg

answer is B.

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Detailed Solution

\large P_{H_2O}^o\;at\;20^oc=17.54mm\;of\;Hg

VP doesn't depend on volume of liquid taken

V.P of liquid varies exponentially with temperature

\large \because

temperature is kept constant

V.P of liquid remains constant irrespective of the volume of  liquid 

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