The standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is -0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be:
1. +0.89 V
2. +0.18 V
3. +1.83 V
4. +1.199 V
|Zn(s) + Ag2O(s) + H2O(l) \(\rightleftharpoons\) 2Ag(s) + Zn2+(aq) + 2OH–(aq)|
If half-cell potentials are:
|Zn2+(aq) + 2e–→ Zn(s)||Eo = – 0.76 V|
|Ag2O(s) + H2O(l) + 2e– → 2Ag(s) + 2OH–(aq)||Eo = 0.34 V|
The cell potential will be:
1. 0.42 V
2. 0.84 V
3. 1.34 V
4. 1.10 V
The correct increasing order of reducing the power of the metals is:
|K+/K = –2.93 V|
|Ag+/Ag = 0.80 V|
|Hg2+/Hg = 0.79 V|
|Mg2+/Mg = –2.37 V|
|Cr3+/Cr = – 0.74 V|
1. Cr < Mg < K < Ag < Hg
2. Mg < K < Ag < Hg < Cr
3. K < Ag < Hg < Cr < Mg
4. Ag < Hg < Cr < Mg < K
Molten sodium chloride conducts electricity due to the presence of :
1. Free ions.
2. Free molecules.
3. Free electrons.
4. Atoms of sodium and chlorine.
The metal that cannot be produced upon reduction of its oxide by aluminium is :
The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called :
1. Cell potential.
2. Cell emf.
3. Potential difference.
4. Cell voltage.
A gas X at 1 atm is bubbled through a solution containing a mixture of 1 M Y- and 1 M Z- at 25 oC . If the reduction potential of Z > Y > X, then :
1. Y will oxidize X but not Z
2. Y will oxidize Z but not X
3. Y will oxidize both X and Z
4. Y will reduce both X and Z
If = -0.441 V and = 0.771 V, the standard emf of the reaction :
Fe + 2Fe3+→ 3Fe2+ will be :
1. 0.330 V
2. 1.653 V
3. 1.212 V
4. 0.111 V
Consider the following relations for emf of an electrochemical cell:
|(a)||emf of cell = (Oxidation potential of anode) – (Reduction potential of cathode)|
|(b)||emf of cell = (Oxidation potential of anode) + (Reduction potential of cathode)|
|(c)||emf of cell = (Reduction potential of anode) + (Reduction potential of cathode)|
|(d)||emf of cell = (Oxidation potential of anode) – (Oxidation potential of cathode)|
The correct relation among the given options is :
1. (a) and (b)
2. (c) and (d)
3. (b) and (d)
4. (c) and (a)
The correct statement among the following options is:
|1.||Ecell and ∆rG of cell reaction are both extensive properties.|
|2.||Ecell and ∆rG of cell reaction are both intensive properties.|
|3.||Ecell is an intensive property while ∆rG of cell reaction is an extensive property.|
|4.||Ecell is an extensive property while ∆rG of cell reaction is an intensive property.|