Home
Class 12
CHEMISTRY
A solution of [Ni(H2O)6]^(2+) is green b...

A solution of `[Ni(H_2O)_6]^(2+)` is green but a solution of `[Ni(CN)_4]^(2-) is colourless.Explain.

Text Solution

Verified by Experts

In `[Ni(H_2O)_6]^(2+)`,Ni is in +2 state with the configuration `3d^8`. Having two unpaired electrons which do not pair up due to the presence of weak `H_2O` ligand. Hence it is coloured. In d - d transition red light is absorbed and green light is emitted.
But in case of `[Ni(CN)_4]^(2-)`, Ni is in the +2 O.S. with electronic configuration `3d^8`. But due to strong ligand `(CN^(-))` paring takes place. Due to the absene of unpared electrons it is colourless.
Promotional Banner

Topper's Solved these Questions

  • CO-ORDINATION COMPOUNDS

    OMEGA PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS |38 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    OMEGA PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (MCQs)|20 Videos

  • ELECTROCHEMISTRY

    OMEGA PUBLICATION|Exercise MULTIPLE CHOCIE QUESTION |46 Videos

Similar Questions

Explore conceptually related problems

Answer the following: Aqueous solution of Ti^(4+) is colourless, but aqueous solution of Ti^(3+) is violet in colour. Explain.

[Ti (H_2O)_6]^(3+) is coloured while [Sc(H_2O)_6]^(3+) is colourless. Explain.

Explain why [Ti (H_2O)_6]^(3+) is violet while [Ti (H_2O)_6]^(4+) is colourless.

[Cr(NH_3)_6]^(3+) is paramagnetic while [Ni(CN)_4]^(2-) is diamagnetic. Explain why?

Find the oxidation number of Ni [Ni(CN)_3 Cl]^(2-)

[Fe(H_2O)_6]^(3+) is strongly paramagnetic whereas [Fe(CN)_6]^(3-) is weakly paramagnetic. Explain.

Explain [Fe(H_2O)_6]^(3+) is paramagnetic.

Explain: [Ni (CN)_4]^(2-) is diamagnetic while [Ni(Cl)_4]^(2-) is paramagnetic.

OMEGA PUBLICATION-CO-ORDINATION COMPOUNDS -MULTIPLE CHOICE QUESTIONS
  1. A solution of [Ni(H2O)6]^(2+) is green but a solution of [Ni(CN)4]^(2-...

    Text Solution

    |

  2. An example of double salt is

    Text Solution

    |

  3. Write IUPAC name of [Co(NH3)6]Cl3.

    Text Solution

    |

  4. Name of complex [pt(NH3)6]Cl4 is

    Text Solution

    |

  5. [Co(NH3)5 Br]SO4 and [Co(NH3)5 SO4] Br areexamples of which type of i...

    Text Solution

    |

  6. Which complex has square planar structure?

    Text Solution

    |

  7. The number of d-electrons in [Cr(H2O)6]^(3+) (at. No. of Cr = 24 ) is

    Text Solution

    |

  8. The oxidation number of iron in K4[Fe (CN)6] is :

    Text Solution

    |

  9. The IUPAC name of [Co(Cl) (NO2) (en)2 ] Cl is

    Text Solution

    |

  10. Which of the following complex species involves d^2sp^3 hybridisation ...

    Text Solution

    |

  11. Which of the following acts as a positive ligand?

    Text Solution

    |

  12. The co-ordination number of Cr in [Cr(NH3)3(H2O)3]Cl3 is

    Text Solution

    |

  13. The magnetic moment of [Ni(CO4)] is

    Text Solution

    |

  14. The effective atomic number of Cr (Atomic no. = 24) in [Cr (NH3)6]Cl3 ...

    Text Solution

    |

  15. The effective atomic number of Fe in Fe(CO)5 is

    Text Solution

    |

  16. The coordination number of copper in cuprammonium sulphate is

    Text Solution

    |

  17. en is an example of a

    Text Solution

    |

  18. Ferrocene is

    Text Solution

    |

  19. Which of the following ligands is expected to be bidentate?

    Text Solution

    |

  20. The number of unpaired electrons in the complexes [NiCl4]^(-2) and [Ni...

    Text Solution

    |

  21. According to effective atomic number, the central metal acquires

    Text Solution

    |