Relationship between Wavelength of Light absorbed and Colour in Coordination Entities
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Questions and Answers

Why do coordination compounds exhibit characteristic optical properties?

  • Due to the presence of hybridized orbitals (correct)
  • Due to the influence of ligands on the metal atom
  • Due to the formation of set of equivalent orbitals
  • Due to the directional properties of the bonds

Which theory focuses on explaining the nature of bonding in coordination compounds using the influence of ligands on the metal atom?

  • Valence Bond Theory (correct)
  • Molecular Orbital Theory
  • Ligand Field Theory
  • Crystal Field Theory

What orbitals can a metal atom use for hybridization according to Valence Bond Theory?

  • ns, np
  • (n-1)d, ns, np, nd (correct)
  • (n-1)d, ns, np
  • ns, np, nd

Why is Werner's theory unable to answer why certain elements possess the property of forming coordination compounds?

<p>It does not explain why only certain elements form coordination compounds (A)</p> Signup and view all the answers

Which theory attributes the characteristic optical properties of coordination compounds to the presence of set of equivalent orbitals?

<p>Valence Bond Theory (C)</p> Signup and view all the answers

In coordination compounds, why do bonds have directional properties according to Valence Bond Theory?

<p>Due to hybridization of metal orbitals (C)</p> Signup and view all the answers

Why does the complex [Ti(H2O)6]3+ appear violet in color?

<p>Due to excitation of the electron from t2g level to eg level by absorbing blue-green light (A)</p> Signup and view all the answers

What happens to the color of the complex [Ti(H2O)6]Cl3 upon removal of water?

<p>It becomes colorless (D)</p> Signup and view all the answers

What is the relationship between the wavelength of light absorbed and the observed color in coordination compounds?

<p>Different colors are observed based on the energy levels of electron transitions (A)</p> Signup and view all the answers

Why does [Co(NH3)5(H2O)]3+ appear green in color?

<p>Absorption of blue-green light by the complex (A)</p> Signup and view all the answers

What effect does crystal field splitting have on the color of coordination compounds?

<p>Results in a variety of colors observed in different compounds (B)</p> Signup and view all the answers

How does the crystal field theory explain the color of coordination compounds?

<p>By attributing it to d-d transitions of electrons caused by ligand interactions (A)</p> Signup and view all the answers

Which type of isomerism can be exhibited by [Pt(NH3)(Br)(Cl)(py)]?

<p>Geometrical isomerism (A)</p> Signup and view all the answers

How many geometrical isomers are possible for [Cr(NH3)2Cl2(en)] +?

<p>Three (B)</p> Signup and view all the answers

In the compound [CoCl2(en)2], how many optical isomers are present?

<p>One (C)</p> Signup and view all the answers

What color will the complex [Mn(H2O)6] 2– appear in an aqueous solution?

<p>Purple (A)</p> Signup and view all the answers

Which of the following can exhibit both geometrical and optical isomerism?

<p>[Co(NH3)4Cl(NO2)]Cl 2+ (A)</p> Signup and view all the answers

What will the color change be when aqueous copper sulphate reacts with potassium chloride?

<p>Green to red solution (C)</p> Signup and view all the answers

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