A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be: (A) At the center of the tube (B) Near the hydrogen chloride bottle (C) Near the ammonia bottle (D) Throughout the length of the tube

Answer: (B) Near the hydrogen chloride bottle

NH3 is lighter than HCl, thus it diffuses faster. Hence, a white ring of NH4Cl is formed in the tube near the HCl. 

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