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
On the basis of the following Eovalues, the strongest oxidising agent is.
[Fe(CN)6]4-
Fe2+
Fe3+
[Fe(CN)6]3
The equilibrium of the reaction,
2.0 x 1010
4.0 x1010
4.0 x 1015
2.4 x 1010
On heating one end of a piece of a metal, the other end becomes hot because of.
Energised electrons moving to the other end.
Resistance of the metal.
Mobility of atoms in the metal.
Minor perturbation in the energy of atoms
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
The most convenient method to protect the bottom of the ship made of iron is.
Coating it with red lead oxide.
White tin plating.
Connecting it with mg block.
Connecting it with Pb block.
Which one of the following pairs of substances on reaction will not evolve H2 gas.
Iron and H2SO4 (aqueous).
Iron and steam.
Copper and HCI (aqueous).
Sodium and ethyl alcohol.
AI2o3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through molten AI2O3for 6 h, what mass of aluminium is produced ? (Assume 100% current efficiency, at mass of AI = 27 g mol-1)
9.0 x 103g
8.1 x 104g
2.4 x 105g
1.3 x 104g
Given,
0.52 V
0.90 V
0.30 V
0.38 V
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
