The half-cell reaction at the anode during the electrolysis of aqueous sodium chloride solution is represented by :
1. Na+(aq) + e- ⟶ Na(s) ; \(E_{cell}^{o} \ = \ -2.71 \ V \)
2. 2H2O(l) ⟶ O2(g) + 4H+(aq) + 4e- ; \(E_{cell}^{o} \) = 1.23 V
3. H+(aq) + e- ⟶ \(\frac{1}{2}\)H2(g) ; \(E_{cell}^{o} \) = 0.00 V
4. Cl-(aq) ⟶ \(\frac{1}{2}\)Cl2(g) + e- ; \(E_{cell}^{o}\)
The positive value of the standard electrode potential of Cu2+ / Cu indicates that-
(a) | This redox couple is a stronger reducing agent than the H+ /H2 couple |
(b) | This redox couple is a stronger oxidising agent than H+ /H2 |
(c) | Cu can displace H2 from acid. |
(d) | Cu cannot displace H2 from acid. |
of some half cell reactions are given below.
I: \(\mathrm{H}^{+} (a q)+e^{-} \rightarrow \frac{1}{2} \mathrm{H}_2 (g )\quad ; \quad E_{\text {cell }}^0=0.00 \mathrm{~V} \)
II: \(2 \mathrm{H}_2 \mathrm{O(l)} \rightarrow O_2 (g)+4 \mathrm{H}^{+} (a q)+4 e^{-} ; E_{\text {cell }}^{0}=1.23 \mathrm{~V} \)
III: \(2 \mathrm{SO}_4^{2-} (a q) \rightarrow \mathrm{S}_2 \mathrm{O}_8^{2-} (a q)+2 e^{-}, E_{\text {cell }}^{0}=1.96 \mathrm{~V} \)
The correct statements among the following are:
a. | In dilute sulphuric acid solution, hydrogen will be reduced at cathode. |
b. | In concentrated sulphuric acid solution, water will be oxidised at anode. |
c. | In a dilute sulphuric acid solution, water will be oxidised at anode. |
d. | In dilute sulphuric acid solution, SO42- ion will be oxidised to tetrathionate ion at anode. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
= 1.1 V for Daniel cell. Which of the following expressions are correct descriptions of the state of equilibrium in this cell?
(a) 1.1 = KC
(b)
(c)
(d) log KC = 1.1
The correct choice among the given is -
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The conductivity of an electrolytic solution depends on
a. Nature of the electrolyte
b. Concentration of the electrolyte
c. Power of AC source
d. Distance between the electrodes
The correct statements from the four statements given above are:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
can be represented by-
a.
b.
c.
d.
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
What will happen during the electrolysis of an aqueous solution of CuSO4 by using platinum electrodes?
(a) | Copper will deposit at cathode |
(b) | Copper will deposit at the anode |
(c) | Oxygen will be released at the anode |
(d) | Copper will dissolve at the anode |
The correct choice among the given is -
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (a, c) |
What will happen during the electrolysis of aqueous solution of CuSO4 in the presence of Cu electrodes?
(a) | Copper will deposit at cathode |
(b) | Copper will dissolve at anode |
(c) | Oxygen will be released at anode |
(d) | Copper will deposit at anode |
The correct choice among the given is -
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (a, d) |
The correct choice among the given regarding formula of Conductivity is -
(a)
(b)
(c)
(d)
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Molar conductivity of ionic solution depends on
(a) | Temperature |
(b) | Distance between electrodes |
(c) | Concentration of electrolytes in solution |
(d) | Surface area of electrodes |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)