Q15 / 160 · TS EAMCET 2024 (09 May Shift 2) · Chemistry

Which of the following does not exist?

  • A
    $\left[\mathrm{GeCl}_6\right]^{2-}$
  • B
    $\left[\mathrm{SiF}_6\right]^{2-}$
  • Correct answer
    C
    $\left[\mathrm{SiCl}_6\right]^2$
  • D
    $\left[\mathrm{Sn}(\mathrm{OH})_6\right]^{2-}$

Solution

$\left[\mathrm{SiCl}_6\right]^{-2}$ does not exist because six large chloride ions can not fit around the smaller $\mathrm{Si}^{4+}$ ion, causing repulsion between ions. The other species $\left[\mathrm{GeCl}_6\right]^{-2},\left[\mathrm{SiF}_6\right]^{-2},\left[\mathrm{Sn}(\mathrm{OH})_6\right]^{-2}$ exist because of the d- orbitals in $\mathrm{Ge}, \mathrm{Si}, \mathrm{Sn}$.

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

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