Which of the following shows maximum number of oxidation states ?
N
Fe
Mn
Cr
Faraday constant
is a numerical constant
depends on equivalent
depends upon the current passed
depends on the number of electrons
The specific conductance of a normal solution of KCl at 25oC is 0.003 Ω-1-cm-1 If cell constant is 1.2 cm-1 , then resistance of a cell, containing this solution, will be
100 Ω
200 Ω
300 Ω
400 Ω
In the reaction A + e- →A-
A is readily oxidised
A is readily reduced
A- is readily oxidised
A- is readily reduced
The oxidation number of sulphur in H2S2O8 is
-2
+2
+5
+7
The cell used for the electrolysis of fused NaCl is
Down's cell
Castner cell
Solvay cell
Nelson cell
The oxidation number of As in H2AsO4- is
6
7
5
9
Aluminium oxide is electrolysed to obtain aluminium metal (At. weight = 27 a.m.u.; 1 Faraday = 96,500 C). The cathode reaction is Al3+ + 3e- →AloTo prepare 5.12 kg of aluminium metal by this method would require
5.49 × 107C of electricity
1.83 × 107C of electricity
5.49 × 104C of electricity
5.49 × 101C of electricity
When 1 Faraday current is passed, which of the following would deposit 1g atomic weight of the metal?
NaCl
BaCl2
AlCl3
CuSO4
On the basis of the information available from the reaction , ΔG = -827 kJ-mol-1 of O2. The minimum e.m.f. required to carry out the electrolysis of Al2O3 is (F = 96500 C-mol-1)
4.28 V
6.42 V
8.56 V
2.14 V
