\( \mathrm{PtCl}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O} \) can exist as a hydrated complex. Its 1...

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\( \mathrm{PtCl}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O} \) can exist as a hydrated complex. Its 1 molal aq. solution has depression in freezing point of \( 3.72 \). Assume \( 100 \% \) ionisation and \( K_{f}\left(\mathrm{H}_{2} \mathrm{O}\right)=1.86^{\circ} \mathrm{C} \mathrm{mol}^{-1} \mathrm{~kg} \), then complex is :
(a) \( \left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{4} \)
(b) \( \left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O} \)
(c) \( \left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \mathrm{Cl}_{3}\right] \mathrm{Cl} \cdot 3 \mathrm{H}_{2} \mathrm{O} \)
(d) \( \left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2} \mathrm{Cl}_{4}\right] \cdot 4 \mathrm{H}_{2} \mathrm{O} \)
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