A metal M and its compound can give the following observable changes in a consequence of reactions<b — d and f Block Elements Chemistry Question
Question
A metal M and its compound can give the following observable changes in a consequence of reactions<br>M $\xrightarrow{\text{dilute HNO}_3}$ Colourless solutions $\xrightarrow{\text{aqueous NaOH}}$ White precipitate $\xrightarrow{\text{excess NaOH(aq.)}}$ Colourless solution $\xrightarrow{\text{H}_2\text{S}}$ White precipitate
💡 Solution & Explanation
Step 1: When silver halides are fused with sodium carbonate, they undergo a displacement reaction that initially produces silver carbonate. Step 2: At the high temperatures of fusion, silver carbonate is highly unstable and decomposes to silver oxide, which further decomposes to metallic silver (Ag) and oxygen. Step 3: The overall reaction is: 4AgCl + 2Na2CO3 ---> 4NaCl + 2CO2 + O2 + 4Ag. Hence, metallic silver (Ag) is formed, matching option (c).