Chemistry
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.
Electrolysis
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Answer
The electrode at which anions donate excess electrons and are oxidized to neutral atoms is the anode
On electrolysis, Ag1+ and H1+ ions migrate to the cathode and Ag1+ are discharged.
Electrolysis is a redox reaction in which reduction reaction takes place at the cathode .
According to Arrhenius's theory the amount of electricity conducted by the electrolyte depends on the concentration of the ions in solution.
Salts ionize in aq. soln. on passage of electric current to give positive ions other than H+ ions.
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Related Questions
Match the statements 1 to 5 with their answers selected from A to J.
A: Cathode, B: Sucrose soln., C: Cl1-, D : Formic acid, E: Electrometallurgy, F: Ammonia, G: Mg2+, H: Electrorefining, I: Sulphur dioxide, J: Anode.
- A compound containing molecules only.
- A compound which ionizes in soln. state but not in gaseous state.
- The ion which accepts electrons from the cathode and gets reduced to neutral atoms.
- The electrode to which the cyanide ions of aq. Na[Ag(CN)2] migrate during electrolysis.
- An application of electrolysis in which the anode does not generally diminish in size.
Complete the table given below:
Nature of Anode Nature of Cathode Ions present in electrolyte Ion/s discharged at Cathode / Anode 1. Electroplating an iron rod with silver 2. Electroplating a copper sheet with nickel 3. Electrorefining of silver 4. Extraction of potassium from KCl 5. Extraction of aluminium from Al2O3 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
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]
- The cation discharged at the cathode most readily.