White crystal (A) on treatment with AgNO3 gives white crystalline precipitate. (A) discharge the col — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Step 1: On reacting with silver nitrate (AgNO3), nitrite (NO2^-) ions form a white crystalline precipitate of silver nitrite (AgNO2). Step 2: Nitrite is a reducing agent that readily reduces the purple/violet potassium permanganate (KMnO4) solution to colorless manganese(II) ions without producing gas, as the nitrite is oxidized to nitrate (NO3^-). Step 3: This characteristic behavior confirms the presence of the nitrite (NO2^-) radical, corresponding to option (c).