At room temperature, NH₃(g) and HX(g) are passed into a 1 m long tube from two opposite ends at the same pressure. The formation of NH₄X(s) will be closest from the injection of HX end when HX is

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The deposit forms closest to the HX end when HX diffuses slowest, i.e., has the largest molar mass (r ∝ 1/√(M)). HI (M = 128) is the heaviest of HCl (36.5), HBr (81), HF (20). Confirms Ans: (d) HI.

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