All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2007 Chemistry

Q. 37. The density (in g mL^–1) of a 3.60 M sulphuric acid solution that is 29%
H₂SO₄ (Molar mass = 98 g mol^–1) by mass will be

1. .64
2. 1.88
3. 1.22
4. 1.45

Sol: Let the mass of solution be x g.

Correct choice: (3)

Q. 38. The first and second dissociation constants of an acid H₂A are 1.0 × 10^–5 and 5.0 × 10^–10 respectively. The overall dissociation constant of the acid will be

1. 5.0 × 10^–5
2. 5.0 × 10¹⁵
3. 5.0 × 10^–15
4. 0.2 × 10⁵

Sol:

Correct choice: (3)

Q. 39. A mixture of ethyl alcohol and propyl alcohol as vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be

1. 350
2. 300
3. 700
4. 360

Sol:

Correct choice: (1)

Q. 40. In conversion of lime–stone to lime,
The values of and are +179.1 kJ mol^–1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that and do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is

1. 1008 K
2. 1200 K
3. 845 K
4. 1118 K

Sol: The decomposition of CaCO₃ to CaO and CO₂ would become spontaneous when would be –ve. But limiting condition can be arrived at when would become zero.

Correct choice: (4)