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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Which one of the following metal complexes is most stable?
  • A
    $\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{2}$
  • ✓
    $\left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$
  • C
    $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2}$
  • D
    $\left[\mathrm{Co}(\mathrm{en})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{Cl}_{2}$
✓

Answer

Correct option: B.
$\left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$
b
Complex $\left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$ is most stable complexamong the given complex compounds because more number of chelate rings are present in thiscomplex as compare to others.

$(1)$ $\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{2}$ $\quad\quad\quad1$ chelate ring

$(2)$ $\left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$ $\quad\quad\quad\quad\quad\quad3$ chelate ring

$(3)$ $\left[\mathrm{Co}(\mathrm{en})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{Cl}_{2}$ $\quad\quad\quad2$ chelate ring

$(4)$ $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2} \quad\quad\quad\quad\quad0$ chelate ring

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