25.0 cm³ of a 0.0500 M solution of sodium oxalate (Na₂C₂O₄) reacted with 24.8 cm³ of a solution of KMnO₄, A, in the presence of excess H₂SO₄. 25.0 cm³ of a 0.0494 M solution of NH₂OH in H₂SO₄ was boiled with an excess of iron(III) sulfate solution, and when the reaction was complete, the iron(II) produced was found to be equivalent to 24.65 cm³ of solution A. The product B formed from the NH₂OH in this reaction can be assumed not to interfere with the determination of iron(II). What can you deduce about the identity of B?