General
✓✗The volume of O2 liberated at STP (molar volume 22.4 L mol−1) at the anode when 9650 C of electricity is passed through acidified water is
- 0.28 L
- 0.56 L
- 1.12 L
- 2.24 L
General
✓✗The standard conditions for measuring standard electrode potentials are
- 1 M (unit activity) solutions, 1 bar gas pressure and 298 K
- 0.1 M solutions and 273 K
- any concentration at 298 K
- 1 M solutions and 373 K
General
✓✗A solution contains Fe2+, Fe3+ and I− ions. This solution was treated with iodine at 35 °C. E° for Fe3+/Fe2+ is +0.77 V and E° for I2/2I− is 0.536 V. The favourable redox reaction is
- there will be no redox reaction
- I− will be oxidised to I2
- I2 will be reduced to I−
- Fe2+ will be oxidised to Fe3+
General
✓✗The emf of the cell Zn|Zn2+(1 M)||Cu2+(0.01 M)|Cu at 298 K is (E°cell = 1.10 V)
- 1.100 V
- 0.982 V
- 1.159 V
- 1.041 V
General
✓✗The emf of the concentration cell Cu|Cu2+(0.01 M)||Cu2+(1 M)|Cu at 298 K is
- 0.1180 V
- 0.0295 V
- 0.0590 V
- 0.0000 V
General
✓✗The value of E° for Cu2+/Cu is +0.34 V and for Cu+/Cu is +0.52 V. Cu+ in aqueous solution tends to
- reduce Cu2+
- oxidise water
- disproportionate into Cu2+ and Cu
- be stable
General
✓✗A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?
- Iodine
- Chlorine
- Hydrogen iodide
- Sulphur dioxide
General
✓✗The pressure of H2 required to make the potential of the hydrogen electrode zero in pure water at 298 K is
- 10−14 atm
- 10−4 atm
- 10−12 atm
- 10−10 atm
General
✓✗To protect iron against corrosion, the most durable metal plating on it is
- tin plating
- copper plating
- nickel plating
- zinc plating
General
✓✗By convention, standard electrode potentials are reported as
- cell potentials
- standard reduction potentials
- ionisation energies
- standard oxidation potentials
General
✓✗The strongest reducing agent in aqueous solution among the following is
- K
- Na
- Mg
- Li
General
✓✗The electrolysis of a 1 L solution of 0.1 M CuSO4 with a current of 2 A for 965 s (Pt electrodes) leaves a Cu2+ concentration of (volume unchanged)
- 0.08 M
- 0.09 M
- 0.11 M
- 0.10 M
General
✓✗Given E°(MnO4−/MnO2) = 1.70 V and E°(MnO2/Mn2+) = 1.23 V, the value of E°(MnO4−/Mn2+) is
- 1.512 V
- 2.930 V
- 1.418 V
- 1.465 V
General
✓✗At what concentration of Cu2+ will the potential of a copper electrode be zero at 298 K? (E°(Cu2+/Cu) = 0.34 V; give log [Cu2+])
- −5.8
- −23.1
- −11.5
- 11.5
General
✓✗In cell notation, a double vertical line (||) represents
- the anode
- a semipermeable membrane only
- a phase boundary between electrode and solution
- a salt bridge