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Q.

A vessel containing 10 litres of air at atmospheric pressure (760 mm of Hg) is connected with an evacuated 9 litre vessel. The resultant air pressure will be:

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a

1440 mm of Hg

b

40 mm of Hg

c

400 mm of Hg

d

760 mm of Hg

answer is C.

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Detailed Solution

Now the total volume will be 19 litres

$P_{1} V_{1} = P_{2} V_{2} \Rightarrow P_{2} = P_{1} (\frac{V_{1}}{V_{2}}) = (760) (\frac{10}{19}) = 400 mm of Hg$

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