Q. No.
At 25C temperature Zn electrode is placed in 0.1M solution of zinc salt then what will be the reduction potential ? If it is assumed that salt dissociates 25% at this dilution ()
(1) -0.713 V
(2) - 0.81 V
(3) + 0.778 V
(4) - 0.84 V
The reduction potential of Hydrogen electrode is -118mV then the concentration of ion in solution will be :-
(1) 10-4M
(2) 2M
(3) 0.01M
(4) 10-3M
The maximum work which can be obtained from a Daniel cell \(Zn_{(s)}\ |\ Zn^{+2}_{(aq)}\ || Cu^{+2}_{(aq)}\ |\ Cu_{(s)}\) is:
| \(E^o_{Zn^{2+}/Zn}\) | −0.76 V |
| \(E^o_{Cu^{2+}/Cu}\) | 0.34 V |
1. +106.15 kJ
2. -212.3 kJ
3. -424.6 kJ
4. +212.3 kJ
CuSO4 solution is treated separately with KCl and KI. In which case, Cu+2 will be reduced to ?
(1) with KCl
(2) with KI
(3) with KCl and KI both
(4) None of these
How many coulombs are required to oxidise 1 mol H2O2 to O2 ?
(1) 9.65 X 104 C
(2) 9.3 X 104 C
(3) 1.93 X 105 C
(4) 19.3 X 102 C
The quantity of electricity required to reduce 12.3 g of nitrobenzene to aniline with 50 % current efficiency is:
1. 1 F
2. 0.6 F
3. 0.5 F
4. 1.2 F
Electrolysis of hot aqueous solution of NaCl gives NaClO4 as-
How many faraday are required to obtain 1000 g of sodium perchlorate ?
(1) 66 F
(2) 122.5 F
(3) 15.13 F
(4) 1.86 F
Which of the following is an incorrect statement :-
1. Mercury cell is a primary cell providing a constant potential
2. During recharging lead storage cell works as electrolytic cell
3. Galvanised iron does not rust
4. In electrolytic cell reduction occurs at anode and in galvanic cell oxidation takes place at anode
For the cell reaction
the change in free energy at a given temperature is a function of
(1) lnC1
(2) ln
(3) ln (C1 +C2)
(4) lnC2
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