Chemistry Oxidation States Quiz

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Questions and Answers

Which oxidation state is most common among the lanthanoids?

  • 4 (correct)
  • 3
  • 2
  • 5

Among the actinoid elements, which group shows the highest oxidation state of +7?

  • Np, Pu, Am
  • U, Fm, Th (correct)
  • Es, No, Lr
  • U, Th, Md

Which statement is not correct?

  • In lanthanoid series ionic radius of Ln3+ ions decreases
  • La is actually an element of transition metal series rather than lanthanide series (correct)
  • La(OH)2 is less basic than Lu(OH)3
  • Atomic radii of Zr and Hf are the same because of lanthanide contraction

Which type of isomerism is exhibited by [Pt(NH3)2Cl2]?

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

Which complex is not expected to exhibit isomerism?

<p>[Co(NH3)5 SO4]Cl (A)</p> Signup and view all the answers

Which complex exhibits Fac-mer isomerism?

<p>[Co(en)3]3+ (D)</p> Signup and view all the answers

What is the most common oxidation state exhibited by lanthanoids?

<p>3 (D)</p> Signup and view all the answers

Which actinoid elements can show the highest oxidation state of +7?

<p>U, Fm, Th (D)</p> Signup and view all the answers

Which complex is not expected to exhibit isomerism?

<p>[Co(NH3)5 SO4]Cl (C)</p> Signup and view all the answers

Which type of isomerism is shown by [Pt(NH3)2Cl2]?

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

Which complex has a metal oxidation number of zero?

<p>Both (b) and (c) (D)</p> Signup and view all the answers

Which complex is paramagnetic in nature?

<p>[Co(NH3)6]3+ (B)</p> Signup and view all the answers

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Study Notes

Lanthanoids and Actinoids

  • The most common oxidation state among lanthanoids is +3.
  • Actinoid elements that can show the highest oxidation state of +7 are Protactinium (Pa) and Neptunium (Np).

Isomerism in Complexes

  • [Pt(NH3)2Cl2] exhibits cis-trans isomerism.
  • The complex that is not expected to exhibit isomerism is [Ni(CO)4].
  • The complex that exhibits Fac-mer isomerism is [Co(NH3)3(NO2)3].
  • The complex that has a metal oxidation number of zero is [Ni(CO)4].
  • The complex that is paramagnetic in nature is [CoF6]3-.

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