Give the electrode reactions for formation of1. Lead metal and bromine

1.	Give the electrode reactions for formation of1. Lead metal and bromine vapours from molten PbBr2 using inert electrodes2. H2 and O2 gas (2:1) from acidified water using inert Pt electrodes.
Answer» 1. Electrolysis of molten PbBr₂ using inert electrodes. PbBr₂ (l) ⇋ Pb²⁺ (l) + Br^- (l) At cathode: Pb²⁺(l) + 2e^– → Pb (s) At anode: 2Br^– (l) – 2e^–→ 2Br Br + Br → Br₂ (g) 2. Electrolysis of acidified water using Pt electrodes. At cathode : 4H₂O (l) ⇋ 4H⁺(aq) + 4OH^- (aq) 4H⁺(aq) + 4e^– → 4H 2H + 2H^–→ 2H₂ At anode : 4OH⁺ (aq) – 4e^– → 4OH 4OH → 2H₂O (l) + O₂ (g)

Give the electrode reactions for formation of1. Lead metal and bromine vapours from molten PbBr2 using inert electrodes2. H2 and O2 gas (2:1) from acidified water using inert Pt electrodes.

Answer»

1. Electrolysis of molten PbBr₂ using inert electrodes.

PbBr₂ (l) ⇋ Pb²⁺ (l) + Br^- (l)

At cathode:

Pb²⁺(l) + 2e^– → Pb (s)

At anode:

2Br^– (l) – 2e^–→ 2Br

Br + Br → Br₂ (g)

2. Electrolysis of acidified water using Pt electrodes.

At cathode :

4H₂O (l) ⇋ 4H⁺(aq) + 4OH^- (aq)

4H⁺(aq) + 4e^– → 4H

2H + 2H^–→ 2H₂

At anode :

4OH⁺ (aq) – 4e^– → 4OH

4OH → 2H₂O (l) + O₂ (g)

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Give the electrode reactions for formation of1. Lead metal and bromine vapours from molten PbBr2 using inert electrodes2. H2 and O2 gas (2:1) from acidified water using inert Pt electrodes.

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