A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively:
1. H2, O2
2. O2, H2
3. O2, Na
4. O2, SO2
If the half-cell reaction A+eA- has a large negative reduction potential, it follows that:
1. A is readily reduced
2. A is readily oxidized
3. A- is readily reduced
4. A- is readily oxidized
If the E°cell for a given reaction has a negative value, which of the following gives correct relationships for the values of G° and Keq ?
(1) G° >0; Keq< 1
(2) G° >0; Keq>1
(3) G° < 0; Keq> 1
(4) G° <0; Keq< 1
A device that converts energy of the combustion of fuels like hydrogen and methane, directly
into electrical energy is known as:
1. Fuel cell
2. Electrolytic cell
3. Dynamo
4. Ni-Cd cell
A button cell used in watches functions as following
Zn(s) + Ag2O(s) + H2O (l) 2Ag(s) + Zn2+(aq) + 2OH-(aq)
If half cell potentials are
The cell potential will be
1. 0.84 V
2. 1.34 V
3. 1.10 V
4. 0.42 V
During discharge of a lead storage cell, the density of sulphuric acid in the cell-
1. Increases.
2. Decreases.
3. Remains unchanged.
4. Initially increases but decreases subsequently.
On electrolysis of dilute sulphuric acid using Platinum (Pt) electrode, the product obtained at the anode will be:
1. Oxygen gas
2. gas
3. gas
4. Hydrogen gas
For the electrolysis of CuSO4 solution the correct option is:
1. Cathode reaction: Cu2+ + 2e- Cu using Cu electrode.
2. Anode reaction: Cu Cu+ + e- using Cu electrode.
3. Cathode reaction: 2H+ + 2e- H2 using Pt electrode.
4. Anode reaction: Cu Cu2+ + 2e- using Pt electrode.
The cell that will measure the standard electrode potential of a copper electrode is:
1. | \(1 \over 10\) bar) | H+(aq, 1M) || Cu2+(aq, 1M) | Cu Pt(s) | H2(g, |
2. | Pt(s) | H2(g, 1 bar) | H+(aq, 1M) || Cu2+ (aq, 2M) | Cu |
3. | Pt(s) | H2(g, 1 bar) | H+(aq, 1M)|| Cu2+ (aq, 1M) | Cu |
4. | \(1 \over 10\) bar) | H+(aq, \(1 \over 10\)M) || Cu2+(aq, 1M) | Cu Pt(s) | H2(g, |
An electrochemical cell can behave like an electrolytic cell when -
1. Ecell = 0
2. Ecell > Eext
3. Eext > Ecell
4. Ecell = Eext