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Potassium hexachloroplatinate (IV), \( \mathrm{K}_{2}\left[\mathrm{PtCl}_{6}\right] \) adopts anti-fluorite crystal structure. Which of
\( \mathrm{P} \) the following information is correct about ideal

W \( \mathrm{K}_{2}\left[\mathrm{PtCl}_{6}\right] \) crystal ?
(a) \( \mathrm{K}^{+} \)ions occupy all the tetrahedral voids.
(b) The unit cell is \( \mathrm{FCC} \) with respect to \( \mathrm{PtCl}_{6}^{2-} \) ions.
(c) The coordination number of \( \mathrm{PtCl}_{6}{ }^{2-} \) ions is 4.
(d) The coordination number of \( \mathrm{PtCl}_{6}{ }^{2-} \) ions is 8.
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