Standard free energies of formation (in KJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H2O(l) CO2(g) and pentane (g), respectively. The value of Eocell for the pentane-oxygen fuel cell is.
1.968 V
2.0968 V
1.0968 V
0.0968 V
The equivalent conductances of Ba2+ and Cl- are 127 and 76 ohm-1 cm-1 eq-1 respectively at infinite dilution. The equivalent conductance of BaCI2 at infinite dilution will be.
139.52
203
279
101.5
A 5 A current is passed through a solution of zinc sulphate for 40 min. The amount of zinc deposited at the cathode is.
40.65 g
0.4065g
4.065g
65.04g
Without losing its concentration ZnCI2 solution cannot be kept in contact with.
Au
AI
Pb
Ag
The efficiency of a fuel cell is given by.
Eo for the cell, Zn [Zn2+ (aq)] [Cu2+(aq)] Cu is 1.10 V at 25oC. The equilibrium constant for the reaction,
10-37
10-28
10-18
10-17
Standard electrode potentials are
Fe3+ increases
Fe3+ decreases
remains unchanged
Fe2+ decreases
For the cell reaction,
In(C1)
In(C2/C1)
In(C2)
In (C1+C2)
The specific conductance of 0.1 NKCI solution at 23oC is 0.012 ohm-1 cm-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be.
0.142 cm-1
0.66cm-1
0.918cm-1
1.12 cm-1
The equilibrium of the reaction,
2.0 x 1010
4.0 x1010
4.0 x 1015
2.4 x 1010
