An electrochemical cell can behave like an electrolytic cell when -
1. Ecell = 0
2. Ecell > Eext
3. Eext > Ecell
4. Ecell = Eext
The incorrect statement about the solution of electrolytes is:
1. | Conductivity of solution depends upon the size of ions. |
2. | Conductivity depends upon the viscosity of solution. |
3. | Conductivity does not depend upon the solvation of ions present in solution. |
4. | Conductivity of solution increases with temperature. |
Using the data given below find out the strongest reducing agent.
1. Cl-
2. Cr
3. Cr3+
4. Mn2+
Using the data given below find out the strongest oxidizing agent.
\(\mathrm{E_{Cr_{2} O_{7}^{2 -} / Cr^{3 +}}^{\ominus} = 1 . 33 V ; E_{Cl_{2} / Cl^{-}}^{\ominus} = 1 . 36 V \\ E_{Mn O_{4}^{-} / Mn^{2 +}}^{\ominus} = 1 . 51 V ; E_{Cr^{3 +} / Cr}^{\ominus} = - 0 . 74 V}\)
Using the data given above find out in which option the order of reducing power is correct.
1. Cr3+ < Cl– < Mn2+ < Cr
2. Mn2+ < Cl– < Cr3+ < Cr
3. Cr3+ < Cl– < Cr2O72– < MnO4–
4. Mn2+ < Cr3+ < Cl– < Cr
Use the data given above to find out the most stable ion in its reduced form.
1. | Cl- | 2. | Cr3+ |
3. | Cr | 4. | Mn2+ |
The most stable oxidized species among the following is:
\(E_{{\mathrm{Cr}_2 \mathrm{O}_7^2}/ \mathrm{Cr}^{3+}}^{o} =1.33 \mathrm{~V} ; E_{\mathrm{Cl}_2 / \mathrm{Cl}^{-}}^{o}=1.36 \mathrm{~V} \)
\( E_{\mathrm{MnO_{4}}^{-} / \mathrm{Mn}^{2+}}^{o}=1.51 \mathrm{~V} ; E_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{o}=-0.74 \mathrm{~V}\)
1. | Cr3+ | 2. | MnO4- |
3. | Cr2O72- | 4. | Mn2+ |
The quantity of charge required to obtain one mole of aluminium from Al2O3 is :
1. 1 F
2. 6 F
3. 3 F
4. 2 F
The cell constant of a conductivity cell-
1. | Changes with the change of electrolyte. |
2. | Changes with the change of concentration of electrolyte. |
3. | Changes with the temperature of the electrolyte. |
4. | Remains constant for a cell. |
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. |