Q12 / 155 · WBJEE 2016 · Chemistry

In the solid state, $\mathrm{PCl}_{5}$ exists as

  • A
    $\left[\mathrm{PCl}_{4}\right]^{-}$ and $\left[\mathrm{PCl}_{6}\right]^{+}$ ions
  • B
    covalent $\mathrm{PCl}_{5}$ molecules only
  • Correct answer
    C
    $\left[\mathrm{PCl}_{4}\right]^{+}$ and $\left[\mathrm{PCl}_{6}\right]^{-}$ ions
  • D
    covalent $\mathrm{P}_{2} \mathrm{Cl}_{10}$ molecules only

Solution

$\mathrm{PCl}_{5}$ exists as $\left[\mathrm{PCl}_{4}\right]^{+}$ and $\left[\mathrm{PCl}_{6}\right]^{-}$ in solid state. $$ 2 \mathrm{PCl}_{5} \longrightarrow\left[\mathrm{PCl}_{4}\right]^{+}\left[\mathrm{PCl}_{6}]^{-}\right. $$

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

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