Chemistry CBSE Class 12 Sample Paper for 2023 Boards - Solutions

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Solutions to CBSE Sample Paper - Chemistry Class 12

Question 23 - Chemistry CBSE Class 12 Sample Paper for 2023 Boards - Solutions - Solutions to CBSE Sample Paper - Chemistry Class 12

Last updated at April 16, 2024 by

Corrosion is an electrochemical phenomenon. The oxygen in moist air reacts as follows:

O 2 (g) + 2H 2 O(l) + 4e – → 4OH – (aq).

Write down the possible reactions for corrosion of zinc occurring at anode, cathode, and overall reaction to form a white layer of zinc hydroxide

 

Answer:

Anode: Zn (s) → Zn 2+ (aq) + 2 e-

Cathode: O 2 (g) + 2H 2 O(l) + 4e – → 4OH – (aq).

Overall: 2 Zn (s) + O 2 (g) + 2H 2 O(l) → 2 Zn 2+ (aq) + 4OH – (aq)

2 Zn (s) + O 2 (g) + 2H 2 O(l) → 2 Zn(OH) 2 (ppt)

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