In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm3 at 273 K? (KCET 2010)

Ideal gas equation, PV = nRT When V and T are same P n Thus, lower the number of moles of gas, lesser the pressure it will exert. Hence, 4 weight 0.0355 ( ) 5 10 molecular weight 71 a n mol x 3 0.071 ( ) 1 10 71 b n mol x 21 23 number of moles 6.023 10 ( ) 0.01 6.023 10 A c n mol N x x ( ) 0.02 d n mol Thus, 0.0355 g chlorine will exert the least pressure in a vessel.