Which of the following statement is incorrect ?A. `NO` is heavier than – InterviewSolution

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1.	Which of the following statement is incorrect ?A. `NO` is heavier than `O_2`B. The formula of heavy water in `D_2 O`.C. Nitrogen diffuses faster than oxygen through an orifice.D. `NH_3` can be used as a refrigerant.
Answer» Correct Answer - A Molecular weight `(Mw) NO = 14 + 16 = 30` Vapour density `= (Mw)/(2) = (30)/(2) = 15` Molecular weight `(Mw) of O_2 = 16 + 16 = 32` Vapour density `= (Mw)/(2) = (32)/(2) = 16` Therefore, `NO` is lighter than `O_2`. Hence statement (a) is incorrect. ( c) `Mw of N_2 = 28, Mw of O_2 = 32`, Rate of diffusion or effusion in inversely proportional to the square root of their molecular weight or vapour densities. Since the `Mw` of `N_2` is less than `Mw` of `O_2`, so `N_2` diffuses faster than `O_2`.

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