NCERT/Class 12/Chemistry/Coordination Compounds

Coordination Compounds

Class 12 · Chemistry

35 questions13 easy12 medium10 hard

Sample Questions

Q1.[Ni(CN)4]²⁻ is square planar and diamagnetic while [NiCl4]²⁻ is tetrahedral and paramagnetic. This difference is explained by:

  • ADifferent coordination numbers
  • BDifferent oxidation states of Ni
  • CCrystal field strength of ligands (CN⁻ is strong field, Cl⁻ is weak field)
  • DDifferent charges on the complexes

Q2.A complex [CoCl2(en)2]⁺ exists in both cis and trans forms. Only the cis form shows optical isomerism. Why?

  • AThe trans form has a higher coordination number
  • BThe trans form has a plane of symmetry making it achiral, while the cis form is chiral
  • CThe cis form has a different oxidation state of Co
  • DThe trans form contains different types of ligands

Q3.Which of the following does NOT show geometric isomerism?

  • A[Pt(NH3)2Cl2] (square planar)
  • B[Co(NH3)4Cl2]⁺ (octahedral)
  • C[Ni(CO)4] (tetrahedral)
  • D[CoCl2(en)2]⁺ (octahedral)

Q4.The hybridisation of the central metal in [Co(NH3)6]³⁺ (inner orbital complex) is:

  • Asp³d²
  • Bd²sp³
  • Csp³
  • Ddsp²

Q5.Which type of isomerism is shown by [Co(NH3)5(NO2)]Cl2 — the red form (–ONO coordination) and the yellow form (–NO2 coordination)?

  • ACoordination isomerism
  • BIonisation isomerism
  • CLinkage isomerism
  • DGeometric isomerism

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Coordination Entity and Central AtomCoordination NumberCrystal Field SplittingCrystal Field TheoryGeometric IsomerismImportance of Coordination CompoundsLigands and Types of LigandsMagnetic PropertiesNomenclature of Coordination CompoundsOptical IsomerismStructural IsomerismValence Bond TheoryWerner's Theory

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