Home
Class 12
CHEMISTRY
Anhydrous cobalt(II) chloride is blue in...

Anhydrous cobalt(II) chloride is blue in colour but on dissolving in water it changes to pink in colour because

A

Its oxidation state changes

B

Its magnetic character changes

C

Its coordination number changes .

D

In water it shows fluorescence

Text Solution

Verified by Experts

The correct Answer is:
C
`Co^(II)CI_2`, has a blue colour in tetrahedral geometry. It changes to pink in colour with the change in coordination number to six.
Promotional Banner

Topper's Solved these Questions

  • THE D- AND F-BLOCK ELEMENT

    BRILLIANT PUBLICATION|Exercise LEVEL-II (ASSERTION-REASON TYPE)|40 Videos

  • THE D- AND F-BLOCK ELEMENT

    BRILLIANT PUBLICATION|Exercise LEVEL-II (ASSERTION-REASON TYPE)|40 Videos

  • SURFACE CHEMISTRY

    BRILLIANT PUBLICATION|Exercise QUESTIONS (LEVEL - II) (ASSERTION REASON TYPE QUESTIONS) |6 Videos

  • THE D-AND F-BLOCK ELEMENTS

    BRILLIANT PUBLICATION|Exercise QUESTIONS (LEVEL-III)|50 Videos

Similar Questions

Explore conceptually related problems

Blue colour of sea is due to

Cuprous ion is colourless, while cupric ion is coloured because

A metal sulphide which is soluble in water and is white in colour

Assertion : Anhydrous copper (II) chloride is covalent while anhydrous copper (II) fluoride is ionic in nature. Reason : In halides of transition metals, the ionic character decreases with increase in atomic mass of the halogen.

Cobalt (III) chloride is dissolved in ammonia. A purple coloured cobalt ammonium complex is isolated. It is

Blue colour of water in sea is due to

Schiff’s reagent give pink colour with:

BRILLIANT PUBLICATION-THE D- AND F-BLOCK ELEMENT-LEVEL-II
  1. Consider the following complex ions P, Q and R: P=[FeF6]^(3-), Q=[V(...

    Text Solution

    |

  2. Which one of the following does not correctly represent the correct or...

    Text Solution

    |

  3. Consider the following statements in respect of lanthanides: The basi...

    Text Solution

    |

  4. The electronic configuration of Cu(II)is 3d^9 whereas that of Cu(I) is...

    Text Solution

    |

  5. Interstitial compounds are formed when small atoms are trapped inside ...

    Text Solution

    |

  6. Although Zirconium belongs to 4d transition series and Hafnium to 5d t...

    Text Solution

    |

  7. Anhydrous cobalt(II) chloride is blue in colour but on dissolving in w...

    Text Solution

    |

  8. Which of the following statements is correct?

    Text Solution

    |

  9. The maximum oxidation state shown by, V(Z=23), Cr (Z=24), Co(z=27), Sc...

    Text Solution

    |

  10. Which of the following compounds is used as the starting material for ...

    Text Solution

    |

  11. An aqueous solution of FeSO4.Al2(SO4)3 and chrome alum is heated with ...

    Text Solution

    |

  12. A solution of a metal ion when treated with KI gives a red precipitate...

    Text Solution

    |

  13. Which of the following statements is wrong?

    Text Solution

    |

  14. Which of the following statements is incorrect?

    Text Solution

    |

  15. Which is not true statement about FeO ?

    Text Solution

    |

  16. Paramagnetism is given by the relation mu = 2sqrt(s(s+1) magnetons whe...

    Text Solution

    |

  17. The oxygen carrying pigment, oxy-hảemocyanin, containing two copper io...

    Text Solution

    |

  18. Which one of the following statements is not correct?

    Text Solution

    |

  19. Consider a titration of potassium dichromate solution with acidified M...

    Text Solution

    |

  20. K3 [Fe(CN)6] is used as an external indicator in the dichromate estim...

    Text Solution

    |