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
On the basis of the following Eovalues, the strongest oxidising agent is.
[Fe(CN)6]4-
Fe2+
Fe3+
[Fe(CN)6]3
Given,
0.52 V
0.90 V
0.30 V
0.38 V
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
The efficiency of a fuel cell is given by.
4.5 g of aluminium (at.mass 27 u) is deposited at cathode from AI3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be.
44.8 L
22.4 L
11.2 L
5.6 L
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
The equivalent conductance of solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho cm2.
1.25 x 10-5
1.25 x 10-6
6.25 x 10-4
1.25 x 10-4
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
On the basis of the information available from the reaction.
2.14 V
4.28 V
6.42 V
8.56 V
