Q27 / 160 · AP EAMCET 2008 · Chemistry

$$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br} \text { and }\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4 $$ are a pair of isomers.

  • Correct answer
    A
    ionisation
  • B
    ligand
  • C
    coordination
  • D
    hydrate

Solution

$$ \begin{aligned} & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br} \rightleftharpoons\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right]^{+}+\mathrm{Br}^{-}} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4 \rightleftharpoons\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right]^{2+}+\mathrm{SO}_4^{2-}} \end{aligned} $$ the molecular formula of both of the above compounds is same but on ionisation they give different ions in solution, so they are called ionisation isomers.

Hence, the correct answer is option: 'A'.

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