All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2008 Chemistry

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 pK_a of a weak acid, HA is 4.80. The pK_b 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