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B.Sc Biochemistry The d- and f-Block Elements — practice questions

Explore 1 free The d- and f-Block Elements questions in B.Sc Biochemistry Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** in aqueous solution?Read the answer and worked solution →

Worked practice questions

Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** in aqueous solution?

  1. $\mathrm{Sc^{3+}}$
  2. $\mathrm{Ti^{4+}}$
  3. $\mathrm{V^{2+}}$
  4. $\mathrm{Zn^{2+}}$
Show answer and solution

Correct answer: C. $\mathrm{V^{2+}}$

Colour in transition-metal aquo ions comes from $d$-$d$ transitions, which require partially-filled $d$-orbitals. $\mathrm{Sc^{3+}}$ ($d^0$), $\mathrm{Ti^{4+}}$ ($d^0$) and $\mathrm{Zn^{2+}}$ ($d^{10}$) all have either empty or completely filled d-shells, so they are colourless. $\mathrm{V^{2+}}$ is $d^3$, giving a violet colour in solution.

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