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NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Application +4 | -1
A solution made by dissolving 0.875 g0.875 \mathrm{~g} of compound Co(NH3)4Cl3\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_3 in 25 g25 \mathrm{~g} of water freezes at −0.56∘C-0.56^{\circ} \mathrm{C}.

The structural formula of the complex, if cryoscopic constant of water is 1.86 K kg mol−11.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}, is
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Correct option: C
[Co(NH3)4Cl2]Cl\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl}
Option C ([Co(NH3)4Cl2]Cl\left[\mathrm{Co}(\mathrm{NH}_3)_4 \mathrm{Cl}_2\right] \mathrm{Cl}) is correct because the calculated Van't Hoff factor matches the dissociation of the complex into two ions.

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