The conductance of electrolytes increases with
increase in pressure
decrease in pressure
increase in temperature
decrease in temperature
Which of the following reaction is used to make a fuel cell?
2H2(g) + O2(g) → 2H2O(I)
2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(I)
Pb(s) + PbO2(s) + 2H2SO4(aq) →2PbSO4(s) + 2H2O(I)
Cd(s) + 2Ni(OH)3(s) → CdO(s) + 2Ni(OH)2(s) + H2O(I)
In which of the following reaction, ozone acts as a reductant?
Ag2O + O3 → 2Ag + 2O2
KNO2 + O3 → KNO3 + O2
PbS + 4O3 → PbSO4 + 4O2
Na3AO3 + O3 → Na3AsO4 + O2
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
In the reaction : Ag2O + H2O2 → 2Ag + H2O + O2, the H2O2 acts as
reducing agent
oxidising agent
bleaching agent
none of these
The reaction, Ag2+ (aq) + Ag (s) 2Ag+(aq) is an example of?
reduction
oxidation
disproportionation
Comproportionation
In a Daniell cell, the value of standard free energy (ΔGº) is -212.3 kJ at 25ºC. What will be the value of 1n Kc?
65.7
85.7
171.7
343.7
The standard e.m.f of a galvanic cell, with standard electrode potentials of zinc equal to -0.76 V and that of copper equal to + 0.34 V, is
+ 0.76 V
+ 1.1 V
- 0.34 V
- 1.1 V
When 1 Faraday current is passed, which of the following would deposit 1g atomic weight of the metal?
NaCl
BaCl2
AlCl3
CuSO4
During the electrolysis of fused sodium chloride, the anodic reaction is
oxidation of sodium ions
reduction of sodium ions
oxidation of chloride ions
reduction of chloride ions
