A mixed oxide of iron and chromium FeO.Cr_(2)O_(3) is fused with sodium carbonate in the presence of air to form a yellow coloured compound (A). On acidification the compound (A) forms an orange coloured compound (B), which is a strong oxidising agent. Identify (i) the compounds (A) and (B). (ii) write balanced chemical equation for each step.

A mixed oxide of iron and chromium FeO.Cr_(2)O_(3) is fused with sodiu

1.	A mixed oxide of iron and chromium FeO.Cr_(2)O_(3) is fused with sodium carbonate in the presence of air to form a yellow coloured compound (A). On acidification the compound (A) forms an orange coloured compound (B), which is a strong oxidising agent. Identify (i) the compounds (A) and (B). (ii) write balanced chemical equation for each step.
Answer» Solution :`underset((A))underset("Sodium CHROMATE")(4FeCrO_(4)+8Na_(2)CO_(3)+7O_(2)to 8Na_(2)CrO_(4)+2Fe_(2)O_(3)+8CO_(2))` `underset((B))underset("Sodium dichromate")(Na_(2)CrO_(4)+H_(2)SO_(4)toNa_(2)Cr_(2)O_(7)+Na_(2)SO_(4)+H_(2)O)` (A) is sodium chromate (YELLOW) and (B) is sodium dichromate (orange).