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Question

A bottle of dry Ammonia(NH3)and a bottle of dry Hydrogen chloride (HCl)connected through a long tube are opened simultaneously at both ends. The white ammonium chloride (NH4Cl) ring first formed will be:


A

At the center of the tube

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B

Near the hydrogen chloride bottle

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C

Near the ammonia bottle

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D

Throughout the length of the tube

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Solution

The correct option is B

Near the hydrogen chloride bottle


Explanation for correct option

Option (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.

Explanation for incorrect option

Option a) At the centre of the tube.

  • Since the rate of diffusion of both hydrochloric acid and ammonia is different
  • Hence the ring will not form at the centre .This option is incorrect

Option c) Near the Ammonia bottle :

  • we know that the rate of diffusion of ammonia is faster so it will be easily diffused through another end of the tube
  • Hence the ring will not form near the ammonia bottle.Option is incorrect

Option d) Throughout the length of the tube.

  • This option is incorrect since ammonia is diffusing at a faster rate
  • Thus it will reach the other bottle soon and react to give the product.

Hence The white ammonium chloride NH4Cl ring will be first formed Near the Hydrogen chloride bottle.


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