All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2008 Chemistry

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Q. 5.The hydrocarbon which can react with sodium in liquid ammonia is

Sol:

Q. 6.

  1. -0.339 V
  2. -0.26 V
  3. 0.26 V
  4. 0.339 V

Sol:

Q. 7. Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

  1. reduces permanganate to Mn2+.
  2. oxidises oxalic acid to carbon dioxide and water.
  3. gets oxidised by oxalic acid to chlorine.
  4. furnishes H+ ions in addition to those from oxalic acid.

Sol: KMnO4can oxidise HCl along with oxalic acid into Cl2 and itself gets reduced to Mn2+.

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