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(a). An ore (A) on roasting with sodium ...

(a). An ore (A) on roasting with sodium carbonate and lime in the presence of air gives two compounds (B) and (C).
(b). The solution of (B) in conc. HCl on treatment with potassium ferroyanide gives a blue colour or precipitate of compound (D).

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The correct Answer is:
The ors is chromite `FeOCr_(2)O_(3)`.
`4FeO, Cr_(2)O_(3)underset((B))(+)8Na_(2)CO_(3)underset((C))(+)7O_(2) overset("Lime")(rarr)2Fe_(2)O_(3)+8Na_(2)CrO_(4)`
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(i)A blue coloured compound (A) on heating gives two product (B) & ( C) . (ii)A metal (D) is deposited on passing hydrogen through heated (B) . (iii)The solution of (B) in HCl on treatment with the [Fe(CN)_(6)]^(4-) gives a chocolate brown coloured precipitate of compound (E) . (iv) (C ) turns lime water milky which disappears on continuous passage of (C ) forming a compound (F) . Identigfy (A) to (F) and give chemical equations for the reactions at step (i) to (iv).

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. The oxidation state of central metal ions of (A), (B) and (C ) compounds are respectively :

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. Which of the following is true for compound (C ).

MOTION-Salt Analysis-Exercise - 2 (Level-II)
  1. An inorganic compound (A) is formed on passing a gas (B) through a con...

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  2. On additing (A) into a dilute solution of silver nitrate a white preci...

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  3. On adding two or three drops of FeCl(3) into the excess of solution (A...

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  4. On adding a solution of (A) into the solution of cupric chloride, a wh...

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  5. A black coloured compound (B) is formed on passing H(2)S through the s...

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  6. (B) on treatment with HCl and potassium chlorate gives (A).

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  7. (A) on treatment with KCN gives a buff coloured precipitate which diss...

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  8. The compound (C) is changed into a compound (D) when its aqueous solut...

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  9. The solution of (A) was treated with excess of NaHCO(3) & then with br...

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  10. (i)A blue coloured compound (A) on heating gives two product (B) & ( C...

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  11. (i)A blue coloured compound (A) on heating gives two product (B) & ( C...

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  12. The solution of (B) in HCl on treatment with the K(4)[Fe(CN)(6)] is g...

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  13. (C) turns lime water milky which disappears on continuous passage of (...

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  14. (a). An ore (A) on roasting with sodium carbonate and lime in the pres...

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  15. The solution of (B) in conc. HCl on treatment with potassium ferrocyan...

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  16. The aqueous solution of (C) on treatment with conc. H(2)SO(4) gives a...

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  17. Compound (E) when treated with KCl gives an orange red compound (F) wh...

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  18. The solution of (F) on treatment with oxalic acid and then with an ex...

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  19. Complete the following by identifying (A) to (F). CuSO(4)5H(2)O over...

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  20. (a). CuSO4 .5H2Ooverset(100^@)to(A)overset(230^@)to(B)overset(800^@)to...

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