A mixed oxide of iron and chromium , FeO.Cr_(2)O_(3) is fused with sodium carbonate in 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 oxidizing agent. (i)Identify 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 sod

1.	A mixed oxide of iron and chromium , FeO.Cr_(2)O_(3) is fused with sodium carbonate in 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 oxidizing agent. (i)Identify the compounds (A) and (B) (ii) Write balanced chemical equation for each step.
Answer» Solution :`4FeO. Cr_(2)O_(3) + O_(2) rarr 2Fe_(2)O_(3) + 4Cr_(2)O_(3)` `4Na_(2)CO_(3)+ 2Cr_(2)O_(3) + 3O_(2) rarr 4Na_(2) CrO_(4) + 4CO_(2)] xx 2` `bar ( 4FeO. Cr_(2)O_(3)+ 8 Na_(2)CO_(3) + 7O_(2) rarr UNDERSET("Sodium chromate")underset((A))(8 Na_(2)CrO_(4)) + 2Fe_(2)O_(3)+ 8 CO_(2))` `2Na_(2)CrO_(4) + H_(2)SO_(4) rarr underset("Sodium dichromate")underset((B))(Na_(2)Cr_(2)O_(7))+Na_(2)SO_(4) + H_(2)O`