Home
Class 12
CHEMISTRY
Explain the following : (i) Low spin ...

Explain the following :
(i) Low spin octahedral complexes of nickel are not known.
(ii) The `pi` - complexes are known for transition elememts only.
(iii) CO is a stroger ligand than `NH_(3)` for many metals.

Text Solution

Verified by Experts

(i) For ocahedral complexes , coordination number should be 6. Since , the electronic configuration of Ni is `[Ar] 3d^(8)4s^(2)`. Which can only form the tetrahedral complexes.
(ii) Transition metals/ ions have empty d- orbitals into which the electron - pair can be donated ligands containing `pi` electrons. For example `CH_(2)=CH_(2),C_(5)H_(5)andC_(6)H_(6)`,etc.
CO and `NH_(3)` both are unidentate ligand . But CO is stronger ligand than `NH_(3)` due its large size.
Promotional Banner

Topper's Solved these Questions

  • XII BOARDS

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise SET-1|20 Videos

  • XII BOARDS

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise [SET-1]|36 Videos

  • XII BOARDS

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise [OUTSIDE DELHI : SET -II]|9 Videos

  • SAMPLE PAPER 2019

    XII BOARD PREVIOUS YEAR PAPER ENGLISH|Exercise SECTION: D|1 Videos

Similar Questions

Explore conceptually related problems

State True or false The π-complexes are known for transition metals only

Explain the following: (i) All the octahedral complexes of Ni^(2+) must be outer orbital complexes. (ii) [CoF_(6)]^(3-) is paramgnetic but [Co(CN)_(6)]^(3-) is diamagnetic .

Convert the following in the form of a complex number : (i) (2, -5) (ii) (-3,1) (iii) (0, -2)

Which of the following metal ions cannot form both high spin and low spin octahedral complexes

Explain the following giving an exmaple in each case: (i) Linkage isomersion. (ii) An outer orbital complex . . (iii) A bidentate ligand.

For octahedral Mn(II) and tetrahedral Ni(II) complexes,consider the following statements: (I) Both the complexes can be high spin (ii) Ni(II)complex can be ery rarely be low spin (iii) With strong field ligands ,Mn (II) complexes can be low spin (iv) aqueous solution of Mn(II) ions is yellow in colour .

Explain the following observations : (i) Many of the transition elements are known to form interstitial compounds . (ii) There is a general increase in density from titanium (Z =22) to copper (Z = 29). (iii) The members of the actinoid series exhibit a larger number of oxidation states than the corresponding members of the lanthanoid series.

STATEMENT-1: Co^(+2) form octahedral stable complex with excess KCN. and STATEMENT-2: CN^(-) is stronger ligand than NH_(3) .

Explain the following observations : (i) Fluorine does not exhibit any positive oxidation state. (ii) The majority of known noble gas compounds are those of Xenon. (iii) Phosphorus is much more reactive than nitrogen.

Assign reasons for the following : (i) Cu(I) ion is not known to exist in aqueous solutions. (ii) Transition metals are much harder than the alkali metals. (iii) From element to element, actinoid contraction is greater than the lanthanoid contraction.