Q. No.The correct statement about charging of the lead storage battery is:
1.
PbSO4 anode is reduced to Pb.
2.
PbSO4 cathode is reduced to Pb.
3.
PbSO4 cathode is oxidised to Pb.
4.
PbSO4 anode is oxidised to PbO2.
\(\Lambda _{m(NH_{4}OH)}^{o}\) is equal to -
1. \(\Lambda _{m(NH_{4}OH)}^{o} \ + \ \Lambda _{m(NH_{4}Cl)}^{o} \ - \ \Lambda _{m(HCl)}^{o}\)
2. \(\Lambda _{m(NH_{4}Cl)}^{o} \ + \ \Lambda _{m(NaOH)}^{o} \ - \ \Lambda _{m(NaCl)}^{o}\)
3. \(\Lambda _{m(NH_{4}Cl)}^{o} \ + \ \Lambda _{m(NaCl)}^{o} \ - \ \Lambda _{m(NaOH)}^{o}\)
4. \(\ \Lambda _{m(NaOH)}^{o} \ + \ \Lambda _{m(NaCl)}^{o}\ - \ \Lambda _{m(NH_{4}Cl)}^{o}\)
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- ; \(E_{cell}^{o}\) \(= 1 . 36 V\)
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. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
of some half cell reactions are given below.
| I: | \(\small\mathrm{H}^{+} (a q)+e^{-} \rightarrow \frac{1}{2} \mathrm{H}_2 (g )\quad ; \quad E_{\text {cell }}^0=0.00 \mathrm{~V} \) |
| II: | \(\small2 \mathrm{H}_2 \mathrm{O(l)} \rightarrow O_2 (g)+4 \mathrm{H}^{+} (a q)+4 e^{-} ; E_{\text {cell }}^{0}=1.23 \mathrm{~V} \) |
| III: | \(\small2 \mathrm{SO}_4^{2-} (a q) \rightarrow \mathrm{S}_2 \mathrm{O}_8^{2-} (a q)+2 e^{-}, E_{\text {cell }}^{0}=1.96 \mathrm{~V} \) |
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)
Which of the following expressions are correct descriptions of the state of equilibrium in a daniel cell, if its \(E_{cell}^o\) = 1.1 V?
(a) 1.1 = KC
(b)
(c)
(d) log KC = 1.1
Choose the correct option:
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)
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) |
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