Question

In the laboratory, manganese (II) salt is oxidized to permanganate ion in aqueous solution by:

• A. hydrogen peroxide
• B. conc. nitric acid
• C. peroxy disulphate
• D. dichromate

Hint:

Peroxy disulphate is a strong oxidizer often used in laboratory settings to convert manganese (II) salts to permanganate ions.

Answer 1

The Correct Option is C

Step 1: Manganese (II) salts, such as \( {Mn}^{2+} \), can be oxidized to the permanganate ion \( {MnO}_4^- \) by various oxidizing agents. 
Step 2: Among the Option: 
- Hydrogen peroxide is commonly used to oxidize manganese (II) to permanganate, but it is not the best oxidizer in this case. 
- Conc. nitric acid does not efficiently oxidize manganese (II) to permanganate. 
- Peroxy disulphate (\( {(O}_2{SO}_2{)}_2^{2-} \)) is a powerful oxidizing agent and is known to oxidize \( {Mn}^{2+} \) to \( {MnO}_4^- \), making it the correct choice in this context. 
- Dichromate is also an oxidizing agent but does not directly oxidize manganese (II) to permanganate. 
Thus, the correct answer is option (C).