Write equations for the reactions taking place at cathode and at anode

1.	Write equations for the reactions taking place at cathode and at anode during the electrolysis of :1. Acidified nickel sulphate solution with nickel electrode2. Acidified copper sulphate solution with copper electrode.3. Acidified copper sulphate solution with platinum electrode.4. Acidulated water with inert electrode.5. Molten lead bromide with inert electrodes.6. Electroplating a spoon with silver.
Answer» 1. Cathode : Ni²⁺ + 2e^- → Ni Anode : Ni - 2e^- → Ni²⁺ 2. Cathode : Cu²⁺ + 2e^- → Cu Anode : Cu - 2e^- → Cu²⁺ 3. Cathode : Cu²⁺ + 2e^- → Cu Anode : OH^- - e^-→OH 4OH^- → 2H₂O + H₂ 4. Cathode : H⁺ + e^- → [H] 2[H] → H₂ OH^- - e^- → OH Anode : 4OH → 2H₂O + O₂ 5. Cathode : Pb²⁺ + 2e^- → Pb Anode : 2Br^- - 2e^- → 2 [Br] 2 [Br] → Br₂ 6. Cathode : AgNO₃→ Ag⁺+ NO₃^- Ag⁺ + e^- → Ag Anode : NO^-₃ - e^- → NO₃ Ag + NO₃ → AgNO₃

Write equations for the reactions taking place at cathode and at anode during the electrolysis of :1. Acidified nickel sulphate solution with nickel electrode2. Acidified copper sulphate solution with copper electrode.3. Acidified copper sulphate solution with platinum electrode.4. Acidulated water with inert electrode.5. Molten lead bromide with inert electrodes.6. Electroplating a spoon with silver.

Answer»

1. Cathode : Ni²⁺ + 2e^- → Ni

Anode : Ni - 2e^- → Ni²⁺

2. Cathode : Cu²⁺ + 2e^- → Cu

Anode : Cu - 2e^- → Cu²⁺

3. Cathode : Cu²⁺ + 2e^- → Cu

Anode : OH^- - e^-→OH

4OH^- → 2H₂O + H₂

4. Cathode : H⁺ + e^- → [H]

2[H] → H₂

OH^- - e^- → OH

Anode : 4OH → 2H₂O + O₂

5. Cathode : Pb²⁺ + 2e^- → Pb

Anode : 2Br^- - 2e^- → 2 [Br]

2 [Br] → Br₂

6. Cathode : AgNO₃→ Ag⁺+ NO₃^-

Ag⁺ + e^- → Ag

Anode : NO^-₃ - e^- → NO₃

Ag + NO₃ → AgNO₃

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