The efficiency of a fuel cell is given by.
The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25o C. The equilibrium constant of the reaction would be.
(Given F = 96500 C mol-1; R =8.314 JK-1 mol-1)
2.0 x 1011
4.0 x 1012
1.0 x 102
1.0 x 1010
An electrochemical cell is shown below.Pt,H2[1atm]HCI (0.1M)CH3COOH(0.1M)H2(1atm),Pt.
Emf depends on molarities of acids used.
pH of 0.1 M HCI and 0.1 M CH3COOH is not same
The temperature is constant.
Acids used in two compartments are different.
AI2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through moleten AI2O3 for 6 h, what mass of aluminium is produced ? (Assume 100% current efficiency, at mass ofAI = 27 g mol-1)
9.0 x 103g
8.1 x 104g
2.4 x 105g
1.3 x 104g
Without losing its concentration ZnCI2 solution cannot be kept in contact with.
Au
AI
Pb
Ag
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
0.66 cm-1
0.918 cm-1
1.12 cm-1
Standard free energies of formation (in KJ/mol) at 298 Kare -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
Equivalent conductance of NaCI, HCI and C2H5COONa at infinte dilution are 126.45 ,426.16 and 91 ohm-1 cm2, respectively. The equivalent conductance of C2H5COOH is.
201.28 ohm-1 cm2
390.71 ohm-1 cm2
698.28 ohm-1 cm2
540.48 ohm-1 cm2
Cell reaction is spontaneous when.
Eored is negative.
Eored is positive
is negative
is positive
The equilibrium of the reaction,
2.0 x 1010
4.0 x 1010
4.0 x 1015
2.4 x 1010
