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Assuming ideal gas behaviour, the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is: (Atomic wt. of Cl = 35.5 u) [JEE-Main On line-2018]

1. 1.46
2. 1.64
3. 0.46
4. 0.64

Correct answer: 0.46

Solution

At same T and P, density is proportional to molar mass. Ratio = M(NH3)/M(HCl) = 17/36.5 = 0.46.

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