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# One litre of oxygen at a pressure of 1 atm. and two litres of nitrogen at a pressure of $0.5\;atm.$ are introduced into a vessel of volume 1 litre. If there is no change in temperature, the final pressure of the mixture of gas (in atm) is

$\begin {array} {1 1} (1)\;1.5 & \quad (2)\;2.5 \\ (3)\;2 & \quad (4)\;4 \end {array}$
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answered Nov 7, 2013 by

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