Aq. solution of 'X' --(Na3[Co(NO2)6])--> Yellow ppt. ; Aq. solution of 'X' --(H2[PtCl6])--> Yellow p — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Soda extract (sodium carbonate extract) is prepared to bring anions of insoluble salts into a soluble form as sodium salts. Step 2: It is prepared by boiling the mixture with solid sodium carbonate (Na2CO3) in distilled water (typically in a 1:3 ratio) for 10-15 minutes, followed by filtration. Step 3: The boiling with Na2CO3 in distilled water promotes anion exchange to form soluble sodium salts and insoluble metal carbonates, corresponding to option (d).