A brownish pink deposit of copper metal is seen at the cathode when copper solution is electrolyzed using copper electrodes. The blue colour of Copper Sulphate solution does not face and Copper anode diminishes in mass.
Question
State one observation for the following : Copper sulphate solution is electrolysed using copper electrodes.
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Select the correct answer from the list in bracket: 1. The cation discharged at the cathode most readily. [Fe2+, Cu2+, Pb2+, H1+] 2. The anion discharged at the anode with most difficulty. [SO42-, Br1-, NO31-,OH1-] 3. The metallic electrode which does not take part in an electrolytic reaction. [Cu, Ag, Fe, Ni] 4. The ion/s which is/are discharged during electrolysis of aq. CuSO4 using Cu electrode. [Cu2+, SO42-, H1+, OH1-] 5. A covalent compound which in aqueous state conducts electricity. [CCl4, CS2, NH3, C2H4]
Open Answer »Give balanced equations for the electrode reactions involved in the following conversions at the respective electrodes: 1. Aluminium oxide → Oxygen gas ← Copper [II] Sulphate 2. Copper metal → Copper ions → Copper metal 3. Lead [II] chloride → Chlorine gas ← Hydrochloric acid 4. Hydroxyl ions ← Acidified water → Oxygen gas 5. Potassium bromide → Bromine gas ← Lead bromide
Open Answer »Select the correct word from the words in brackets to complete the sentence: 1. The electrode at which anions donate excess electrons and are oxidized to neutral atoms is the …………… [anode/cathode] 2. On electrolysis, Ag1+ and H1+ ions migrate to the …………… [cathode/anode] and …………… [Ag1+/H1+] are discharged. 3. Electrolysis is a / an …………… [oxidation/reduction/redox] reaction in which reduction reaction takes place at the …………… [cathode/anode]. 4. According to Arrhenius’s theory the amount of electricity conducted by the electrolyte depends on the …………… [nature/concentration] of the ions in solution. 5. Salts ionize in aq. soln. on passage of electric current to give …………… [negative/positive] ions other than H+ ions.
Open Answer »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 |