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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Which of the following complexes has the highest stability constant at $298 \,K$ 
  • A
    ${\left[ {CdC{l_4}} \right]^{2 - }}$
  • B
    ${\left[ {CdB{r_4}} \right]^{2 - }}$
  • C
    ${\left[ {Cd{I_4}} \right]^{2 - }}$
  • ✓
    ${\left[ {Cd{{\left( {CN} \right)}_4}} \right]^{2 - }}$
✓

Answer

Correct option: D.
${\left[ {Cd{{\left( {CN} \right)}_4}} \right]^{2 - }}$
d
(d) The cyano and ammine complexes are far more stable than those formed by halide ions. This is due to the fact that $N{H_3}$ and $C{N^ - }$are strong lewis bases.

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