Chemistry CBSE Class 12 Sample Paper for 2023 Boards - Solutions

Chemistry CBSE Class 12 Sample Paper for 2022 Boards [Term 2] →
Chemistry Class 12
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 Dec. 13, 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)

Go Ad-free
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo