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All India Engineering / Architecture Entrance Examination (AIEEE)

CBSE Guess > AIEEE > AIEEE Papers > Chemistry

AIEEE 2008 Chemistry

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Q. 1. Which one of the following is the correct statement?

  1. Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase.
  2. B2H6.2NH3 is known as 'inorganic benzene'.
  3. Boric acid is a protonic acid.
  4. Beryllium exhibits coordination number of six.

Sol: Becl2 and Alcl3 both have bridged structure in solid phase.
B3N3 H6 is known as inorganic benzene.
Boric acid is Lewis acid.
Beryllium exhibits coordination number of 4

Q. 2.

Sol:

Q. 3. The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

Sol: The correct decreasing order of priority for the functional group of organic compounds in the IUPAC system of nomenclature is:

Q. 4. The pKa of a weak acid, HA is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

  1. 7.01
  2. 9.22
  3. 9.58
  4. 4.79

Sol:

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+.

Q. 8. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

  1. R2SiCl2
  2. R3SiCl
  3. R4Si
  4. RSiCl3

Sol:

Correct answer is (4)

Q. 9. Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below:

The energy involved in the conversion of

  1. –850 kJ mol–1
  2. +120 kJ mol–1
  3. +152 kJ mol–1
  4. –610 kJ mol–1

Sol:

Q. 10. Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

  1. Metal sulphides are less stable than the corresponding oxides.
  2. CO2is more volatile than CS2.
  3. Metal sulphides are thermodynamically more stable than CS2.
  4. CO2is thermodynamically more stable than CS2.

Sol:

Hence, CO2 is more stable than CS2 while Ms are more stable than MO.

Q. 11. Four species are listed below:

Which one of the following is the correct sequence of their acid strength?

(1) (i) < (iii) < (ii) < (iv) (2) (iii) < (i) < (iv) < (ii) (3) (iv) < (ii) < (iii) < (i) (4) (ii) < (iii) < (i) < (iv)

Sol: The increasing order of acidic strength is

Q. 12. Which one of the following constitutes a group of the isoelectronic species?

Sol: Isoelectronic species have same number of electrons

 

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