• # question_answer A sample of air contains only ${{N}_{2}},{{O}_{2}}$ and ${{H}_{2}}O.$ It is saturated with water vapour and the total pressure is 640 torr. the vapour pressure of water is 40 torr and the molar ratio of ${{N}_{2}}:{{O}_{2}}$ is $3:1$. The partial pressure of ${{N}_{2}}$ in the sample is :- A)  480 torr            B)  600 torr C)  525 torr            D)  450 torr

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