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A mixed oxide of iron and chromium, FeO....

A mixed oxide of iron and chromium, `FeO.Cr_2O_3` is fused with sodium carbonate in the presence of air to form a yellow 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 equations for each step.

Text Solution

Verified by Experts

`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`
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