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

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.

Text Solution

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`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).
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U-LIKE SERIES-THE D-AND F-BLOCK ELEMENTS -SHORT ANSWER QUESTIONS (2 marks each)
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  2. Compare the relative stability of +2 oxidation states in aqueous solut...

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  3. A mixed oxide of iron and chromium FeO.Cr(2)O(3) is fused with sodium ...

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  6. Out of Cu(2)Cl(2) and CuCl(2), which is more stable and why ?

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  8. Transition metals show high melting points. Why?

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  9. When Cu^(2+) is treated with KI, a white precipitate is formed. Explai...

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  10. When a brown compound of manganese (A) is treated with HCl it gives a ...

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  11. Explain why (i) E^(@) for Mn^(3+)//Mn^(2+) couple is more positive t...

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  12. With the help of ionic equations, describe what happens when (i) pH ...

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  13. Although Zr belongs to 4d and Hf belongs to 5d transition series, but ...

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  14. The outer electronic configurations of two transition metals are (i) 3...

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  15. The second and third rows of transition elements resemble each other m...

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  16. Although Cr^(3+) and Co^(2+) ions have the same number of unpaired ele...

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  17. Although +3 oxidation state is the characteristic oxidation state of l...

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  18. When orange solution containing CrO(7)^(2-) ion is treated with an alk...

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  19. Explain why does the colour of KMnO(4) disappear when oxalic acid is a...

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  20. E^(@) of Cu is + 0.34 V while that of Zn is – 0.76 V. Explain.

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