XII UNIT 5 PART 4

The ligand → metal bond in a coordination complex is -----

• covalent in nature

• ionic nature

• metallic nature

• none

In the octahedral complexes, if the ------orbitals are involved in hybridisation

• (n-2) f

• (n-1) d

• both (a) and (b)

• none

The complexes containing a central metal atom with unpaired electron(s) are ---------

• dia magnetic.

• ferro magnetic.

• paramagnetic.

• all the above

The complexes containing a central metal atom with the electrons are paired, then the complexes will be -----------

• ferro magnetic

• diamagnetic

• para magnetic

• none

Ligands such as CO, CN^-, en, and NH³ present in the complexes cause pairing of electrons present in the central metal atom. Such ligands are called ------------

• strong field ligands

• weak field ligands

• both (a) and (b)

• none

Magnetic moment (Using spin only formula) --------

• µs =√ n(n+ 2) =0

• µs =√ n(n+ 1) =0

• µs =√ n(n+3 ) =0

• µs =√ n(n+4 ) =0

VB theory does not provide a quantitative explanation as to why certain complexes are inner orbital complexes and the others are outer orbital complexes for the -------

• same non-metal.

• same metal.

• same metalloids

• all the above

How many no. of unparied electrons in [CoF₆]³------

• 3

• 2

• 7

• 4

Geometry of [Ni(CN)₄]^{4 -} -------

• tetrahedral

• octahedral

• square planar

• pyramidal

Greater the overlapping between the ligand orbitals and the hybridised metal orbital, ----------- is the bond strength.

• lesser

• greater

• both (a) and (b)

• none