1
AIEEE 2006
+4
-1
The molar conductivities $$\wedge _{NaOAc}^o$$ and $$\wedge _{HCl}^o$$ and at infinite dilution in water at 25oC are 91.0 and 426.2 Scm2/mol respectively. To calculate $$\wedge _{HOAc}^o$$ , the additional value required is
A
$$\wedge _{{H_2}O}^o$$
B
$$\wedge _{KCl}^o$$
C
$$\wedge _{NaOH}^o$$
D
$$\wedge _{NaCl}^o$$
2
AIEEE 2006
+4
-1
Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100$$\Omega$$. The conductivity of this solution is 1.29 S m–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 $$\Omega$$, The molar conductivity of 0.02 M solution of the electrolyte will be
A
124 $$\times$$ 10–4 S m2 mol–1
B
1240 $$\times$$ 10–4 S m2 mol–1
C
1.24 $$\times$$ 10–4 S m2 mol–1
D
12.4 $$\times$$ 10–4 S m2 mol–1
3
AIEEE 2005
+4
-1
For a spontaneous reaction the ∆G , equilibrium constant (K) and $$E_{cell}^o$$ will be respectively
A
-ve, >1, +ve
B
+ve, >1, -ve
C
-ve, <1, -ve
D
-ve, >1, -ve
4
AIEEE 2005
+4
-1
Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+ + 3e- $$\to$$ Alo To prepare 5.12 kg of aluminium metal by this method would require
A
5.49 $$\times$$ 107 C of electricity
B
1.83 $$\times$$ 107 C of electricity
C
5.49 $$\times$$ 104 C of electricity
D
5.49 $$\times$$ 101 C of electricity
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