A complex is represented as \( \mathrm{CoCl}_{3} . \mathrm{xNH}_{3} \). Its 0.1 molal solution i....

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A complex is represented as \( \mathrm{CoCl}_{3} . \mathrm{xNH}_{3} \). Its 0.1
\( \mathrm{P} \)
molal solution in water shows \( \Delta \mathrm{T}_{\mathrm{f}}=0.558 \mathrm{~K} . \mathrm{K}_{\mathrm{f}} \) for
W
\( \mathrm{H}_{2} \mathrm{O} \) is \( 1.86 \mathrm{~K} \mathrm{molality}^{-1} \). Assuming \( 100 \% \) ionization of complex and co-ordination number of \( \mathrm{Co} \) is six, calculate formula of complex.
(1) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3} \)
(2) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \)
(3) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl} \)
(4) None of these


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