The oxidation-reduction reaction among the following is –

Chemistry Some Basic Concepts of Chemistry The Mole Concept Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

H 2 SO 4 + 2NH 3

(NH 4 ) 2 SO 4

H 2 SO 4 + Na 2 CO 3

Na 2 SO 4 + H 2 O + CO 2

2K 2 CrO 4 + H 2 SO 4

K 2 Cr 2 O 7 + K 2 SO 4 + H 2 O

2H 2 SO 4 + Cu

CuSO 4 + 2H 2 O + SO 2

Text Solution

Verified by Experts

The correct answer is:

1.Reaction :

This is an acid-base reaction. There is no change in the oxidation states of the elements.

2. Reaction :

This is a double displacement reaction (metathesis). There is no change in the oxidation states of the elements.

3. Reaction :

This is a chemical reaction involving chromate and dichromate ions in acidic solution. There is no change in the oxidation states of chromium here.

4. Reaction :

In this reaction:

Sulfur in is in the +6 oxidation state.

In , sulfur is in the +4 oxidation state.

Copper goes from 0 to +2 oxidation state in .

This indicates a redox reaction where sulfur is reduced (from +6 to +4 ), and copper is oxidized (from 0 to +2 ),

Conclusion
, as it involves both oxidation and reduction processes.

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