Home
Class 11
CHEMISTRY
Pick out the correct statement from the ...

Pick out the correct statement from the following:
1. Cobalt (III) is more stable in octahedral complexes.
2. Zinc forms coloured ions or complexes
3. Most of the d-block elements and their compounds are ferromagnetic. ltBrgt 4. Osmium shows (VIII) oxidation state
5. cobalt (II) is more stable in octahedral complexes.

A

1 and 2

B

1 and 3

C

2 and 4

D

1 and 4

Text Solution

Verified by Experts

The correct Answer is:
D
In `Co^(+3)` ion, electronic configuration `|Ar|_(18)3d^(6)4s^(0)`. For octahedral complex 4 unpaired electron get paired and in configuration become `t_(2g)^(6)eg^(0)` and hybridization `d^(2)sp^3`
Os has maximum VIII oxidation state.
Promotional Banner

Topper's Solved these Questions

  • D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS

    RESONANCE|Exercise National Standard Examination In chemistry|35 Videos

  • D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS

    RESONANCE|Exercise Subjective Questions|10 Videos

  • D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS

    RESONANCE|Exercise Exercise 3|65 Videos

  • CHEMICAL EQUILIBRIUM

    RESONANCE|Exercise Advanced Level Problems (Part-3)(Stage-5)|2 Videos

  • GASEOUS STATE

    RESONANCE|Exercise PHYSICAL CHMISTRY (Gaseous State)|47 Videos

Similar Questions

Explore conceptually related problems

The correct statement(s) from among the following is/are? (i). all the d and f-block elements are metals (ii). all the d and f-block elements form coloured ions (iii). All th d- and f-block elements form paramagnetic ions

The correct statement(s) from among the following is//are : (i) all the d and f -block elements are metals (ii) all the d and f -block elements form coloured ions (iii) all the d - and f -block elments form paramagnetic ions

How will you account for the following : (i) Cobalt (II) is stable in aqueous solution but in the presence of a complexing agent, it is easily oxidized. (ii) Out of d^(4) species, Cr^(2+) is strongly reducing while Mn^(2+) is strongly oxidising .

State the reason for the following : (i) Cu (I) ion is not stable in an aqueous solution. (ii) Unlike Cr^(3+),Mn^(2+),Fe^(3+) and the subsequent other M^(2+) ions of the 3d series, the 4d and 5d series metals generally do not form stable oxidation states.

Which of the following statements are wrong (I) Bi^(3+) is more stable than Bi^(5+) (II) Mn shows +8 oxidation state (III) The oxidation state of an element is always less than or equal to its group number (IV) s-block elements show variable oxidation states The answer is

RESONANCE-D & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS -Additional Problems for Self practice (APSP)
  1. Which one of the following dissolves in hot concentrated NaOH?

    Text Solution

    |

  2. how copper wire reacts with oxygen to produce:

    Text Solution

    |

  3. A compound is yellow when hot and white when cold. The compound is:

    Text Solution

    |

  4. At 3000^(@)C FeCl(3):

    Text Solution

    |

  5. When FeSO(4) is strongoly heated, the number of acidic gases produced ...

    Text Solution

    |

  6. On heating ZnCl(2).2H(2)O, the compounds obtained is:

    Text Solution

    |

  7. On heating KMnO(4), one among the following is not formed:

    Text Solution

    |

  8. Reaction of KMnO(4) in neutral or very weakly alkaline solution can be...

    Text Solution

    |

  9. KMnO(4) in excess on treatment with concentrated H(2)SO(4) forms a com...

    Text Solution

    |

  10. Which of the following statement wrong?

    Text Solution

    |

  11. The image on an exposed and developed photographic film is due to

    Text Solution

    |

  12. The yellow colour solution of Na(2)CrO(4) changes to orange red on pas...

    Text Solution

    |

  13. What happens when a molten mixture of K(2)FeO(4) and K(2)CrO(4) is aci...

    Text Solution

    |

  14. Why silver chloride is used I photochromic spectacles?

    Text Solution

    |

  15. In which of the following reactions, reaction of silver with the given...

    Text Solution

    |

  16. Which of the following can be employed for the conversion of potassium...

    Text Solution

    |

  17. Reaction of potassium chromate and CuSO(4) in aqueous solution produce...

    Text Solution

    |

  18. Pick out the correct statement from the following: 1. Cobalt (III) i...

    Text Solution

    |

  19. Transuranic elements begin with

    Text Solution

    |

  20. Lanthanide contraction is observed in:

    Text Solution

    |