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
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
Reduction potential for the following half-cell reactions are.
+0.32 V
-0.32 V
+1.20 V
-1.20 V
On the basis of the information available from the reaction.
2.14 V
4.28 V
6.42 V
8.56 V
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.
In electrolysis of NaCI when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam because.
Hg is more inert than Pt.
More voltage is required to reduce H+ at Hg than at Pt.
Na is dissolved in Hg while it does not dissolved in Pt.
Concentration of H+ ions is larger when Pt electrode is taken.
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
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.
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
The equilibrium of the reaction,
2.0 x 1010
4.0 x 1010
4.0 x 1015
2.4 x 1010