A bottle of dry NH3 and a bottle of dry HCI connected through a long tube are opened simultaneously of both ends. The white NHCl ring formed will be
Correct answer: C. near the HCl bottle
- A. at the center of the tube
- B. near the NH3 bottle
- C. near the HCl bottle
- D. throughout the length of the same tube
Explanation
When connecting the two bottles, the two gases will diffuse into each other.The rate of diffusion is inversely proportional to the square root of molecular mass.Considering the molecular masses (NH3 = 17 and HCl = 36.5), HCl, being the heavier gas, will diffuse slower (cover less distance), while the lighter gas NH3 will diffuse faster (cover more distance). So the white ring of NH4Cl (formed by the reaction of two gases) will be closer to the HCl bottle.This case is explained in option C.A, B, and D do not fit the relation between rate of diffusion and Molecular mass.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About Kinetic Molecular Theory
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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