Coordination Chemistry MCQs

The oxidation state of cobalt in [Co(NH3)5Cl]Cl2[Co(NH₃)₅Cl]Cl₂ is:

• +2

• +3

• +1

• 0

The correct IUPAC name of [Cr(H2O)6]Cl3[Cr(H₂O)₆]Cl₃ is:

• Hexaaquachromium(II) chloride

• Hexaaquachromium(III) chloride

• Chromium hexaaqua chloride

• Hexachloroaquachromium

Which type of isomerism is shown by [Co(NH3)5Br]SO4[Co(NH₃)₅Br]SO₄ and [Co(NH3)5SO4]Br[Co(NH₃)₅SO₄]Br?

• Linkage isomerism

• Ionisation isomerism

• Hydrate isomerism

• Geometrical isomerism

The complex [Co(NH3)4Cl2]+[Co(NH₃)₄Cl₂]^+ can exhibit:

• Optical isomerism

• Geometrical isomerism

• Linkage isomerism

• None of these

The pair [Co(NH3)5(NO2)]Cl2[Co(NH₃)₅(NO₂)]Cl₂ and [Co(NH3)5(ONO)]Cl2[Co(NH₃)₅(ONO)]Cl₂ shows:

• Geometrical isomerism

• Linkage isomerism

• Coordination isomerism

• Structural isomerism

Werner's theory explained:

• Geometry of complexes

• Primary and secondary valencies

• EAN rule

• Both (a) and (b)

The effective atomic number (EAN) of [Fe(CN)6]4−[Fe(CN)₆]^{4-} is:

• 36

• 34

• 32

• 30

Pauling's theory explains geometry on the basis of:

• Ionic radius

• Crystal field splitting

• Hybridisation of metal orbitals

• Magnetic moment

[Ni(CN)4]2−[Ni(CN)₄]^{2-} is square planar because:

• Ni²⁺ is dsp² hybridised due to strong field ligand

• Ni²⁺ is sp³ hybridised due to weak field ligand

• Ni²⁺ has no unpaired electron

• Both (a) and (c)

Magnetic moment of [Cu(NH3)4]2+[Cu(NH₃)₄]^{2+} is approx.:

• 0 BM

• 1.73 BM

• 2.83 BM

• 4.90 BM