All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2008 Chemistry

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⁺.