In order to increase the volume of a gas by 10%, the pressure of the gas should be
increased by 10%
increased by 1%
decreased by 10%
decreased by 1%
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In a flask of ‘V’ litres, 0.2 moles of O2, 0.4 moles of N2, 0.1 moles of NH3 and 0.3 moles of He gases are present at 27°C. If total pressure exerted by these non–reacting gases is 1 atm, the partial pressure exerted by N2 gas is