A vessel contains 14 gm (7 moles) of hydrogen and 96 gm (9 moles) of oxygen at STP. Chemical reaction is induced by passing electric spark in the vessel till one of the gases is consumed. The temperature is brought back to it's starting value 273 K. The pressure in the vessel is


1.  0.1 atm                       

2.  0.2 atm

3.  0.3 atm                       

4.  0.4 atm

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