Question

Acidified potassium dichromate oxidizes sulphides (S\(^{2-}\)) to .......

• A. SO\(_4^{2-}\)
• B. SO\(_3^{2-}\)
• C. Sulphur (S)
• D. SO\(_2\)

Hint:

Acidified potassium dichromate is commonly used to oxidize sulphides to sulphur dioxide (SO\(_2\)) in redox reactions.

Answer 1

The Correct Option is D

Potassium dichromate (K\(_2\)Cr\(_2\)O\(_7\)) in an acidic medium is a strong oxidizing agent and can oxidize sulphides (S\(^{2-}\)) to sulphur dioxide (SO\(_2\)).
The oxidation reaction is as follows: \[ \text{S}^{2-} + 2H^+ + \text{Cr}_2\text{O}_7^{2-} → \text{SO}_2 + 2H_2O + 2Cr^{3+} \] Thus, the correct product of oxidation of sulphides (S\(^{2-}\)) by acidified potassium dichromate is SO\(_2\).
Final Answer: \[ \boxed{\text{The correct product is SO}_(2)} \]