Chemistry
Select the correct answer from the list in bracket:
- The cation discharged at the cathode most readily.
[Fe2+, Cu2+, Pb2+, H1+] - The anion discharged at the anode with most difficulty.
[SO42-, Br1-, NO31-,OH1-] - The metallic electrode which does not take part in an electrolytic reaction.
[Cu, Ag, Fe, Ni] - The ion/s which is/are discharged during electrolysis of aq. CuSO4 using Cu electrode.
[Cu2+, SO42-, H1+, OH1-] - A covalent compound which in aqueous state conducts electricity.
[CCl4, CS2, NH3, C2H4]
Answer
- The cation discharged at the cathode most readily — Cu2+
- The anion discharged at the anode with most difficulty — SO42-
- The metallic electrode which does not take part in an electrolytic reaction —Fe
- The ion which is discharged during electrolysis of aq. CuSO4 using Cu electrode — Cu2+
- A covalent compound which in aqueous state conducts electricity — NH3
Related Questions
Select the correct word from the words in bracket to complete the sentence:
The electrode at which anions donate excess electrons and are oxidized to neutral atoms is the …………… [anode/cathode]
On electrolysis, Ag1+ and H1+ ions migrate to the …………… [cathode/anode] and …………… [Ag1+/H1+] are discharged.
Electrolysis is a / an …………… [oxidation/reduction/redox] reaction in which reduction reaction takes place at the …………… [cathode/anode].
According to Arrhenius's theory the amount of electricity conducted by the electrolyte depends on the …………… [nature/concentration] of the ions in solution.
Salts ionize in aq. soln. on passage of electric current to give …………… [negative/positive] ions other than H+ ions.
Give balanced equations for the electrode reactions involved in the following conversions at the respective electrodes:
- Aluminium oxide → Oxygen gas ← Copper [II] Sulphate
- Copper metal → Copper ions → Copper metal
- Lead [II] chloride → Chlorine gas ← Hydrochloric acid
- Hydroxyl ions ← Acidified water → Oxygen gas
- Potassium bromide → Bromine gas ← Lead bromide
Give reason for the following :
Electrolysis of molten lead bromide is considered a redox reaction.
Give reason for the following :
Lead bromide undergoes electrolytic dissociation in the molten state but is a non-electrolyte in the solid state.