Home
Class 12
CHEMISTRY
(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 potassiu ferroyanide gives a blue colour or precipitate of compound (D).

Text Solution

Verified by Experts

(a). The ore is chromite, `FeOCr_2O_3`.
(a). `4FeO.Cr_2O_3(A)+8Na_2CO_3+7O_2overset(Lime)to2Fe_2O_3(B)+8Na_2CrO_4(C)+8CO_2`
(b). `Fe_2O_3(B)+6HClto2FeCl_3+3H_2O`
`4FeCl_3+3K_4Fe(CN)_6tounderset("prussian blue")(Fe_4[Fe(CN)_6]_3(D)+12KCl`
Promotional Banner

Topper's Solved these Questions

  • D AND F BLOCK ELEMENTS

    CENGAGE CHEMISTRY|Exercise Ex 6.1 Subjective|12 Videos

  • D AND F BLOCK ELEMENTS

    CENGAGE CHEMISTRY|Exercise Ex 6.2 Subjective (Compound Of Fe :)|7 Videos

  • D AND F BLOCK ELEMENTS

    CENGAGE CHEMISTRY|Exercise Archives Subjective|29 Videos

  • COORDINATION COMPOUNDS

    CENGAGE CHEMISTRY|Exercise Archives Subjective|18 Videos

  • ELECTROCHEMISTRY

    CENGAGE CHEMISTRY|Exercise Archieves Subjective|35 Videos

Similar Questions

Explore conceptually related problems

(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 colour at that of (C ) . (v) A solutionof ( A) on treatment with a solution of barium chloride gas 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 ).

(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 colour at that of (C ) . (v) A solutionof ( A) on treatment with a solution of barium chloride gas 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 ).

CENGAGE CHEMISTRY-D AND F BLOCK ELEMENTS-Solved Example
  1. Why in any transition series, melting points first increase and then d...

    Text Solution

    |

  2. Atomic radius of Cu is greater than that of Cr but ionic radius of Cr^...

    Text Solution

    |

  3. Why hydrated copper sulphate is blue while anhydrous copper sulphate i...

    Text Solution

    |

  4. Why are the ionisation energies of 5d elements greater than 3d element...

    Text Solution

    |

  5. Explain why cuprous chloride (CuCI) is colourless white cupric shlorid...

    Text Solution

    |

  6. Describe giving reason which one of the following pairs has the proper...

    Text Solution

    |

  7. Give reason for the following features of transition metal chemistry: ...

    Text Solution

    |

  8. The 4d and 5d series of transition metals have more frequency metal-me...

    Text Solution

    |

  9. (a). K2PtCl2 is a well known compound whereas corresponding is not kno...

    Text Solution

    |

  10. (a). Of the lanthanides, cerium (Z=58) forms a tetrapositive ion, Ce^(...

    Text Solution

    |

  11. (a). Why second asnd third transition series elements show similar siz...

    Text Solution

    |

  12. (a). Chemistry of all the lanthanoids is quite similar. (b). The act...

    Text Solution

    |

  13. Identify A to E. Pyrolusite on heating with KOH in the presence of air...

    Text Solution

    |

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

    Text Solution

    |

  15. (a). A powdered substance (A) on treatment with fusion mixture gives a...

    Text Solution

    |

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

    Text Solution

    |

  17. Identify A to C. (a). An aqueous solution of a compoud (A) is acidic...

    Text Solution

    |

  18. How the following conversions are made? (a). Copper chloride from co...

    Text Solution

    |