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In ferrocyanide ion, the effective atomic number is 36.

Chelating ligands are atleast bidentate ligands.

${[{CrCl}_{2} (CN)_{2} {({NH}_{3})}_{2}]}^{2 +}$ and $[{CrCl}_{3} {({NH}_{3})}_{3}]$ both have $d^{2} {sp}^{3}$ hybridisation.

As the number of rings in complex increases, stability of complex (chelate) also increases.

answer is A.

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Detailed Solution

In ferrocyanide ion, the effective atomic number is 36.

Atomic no. of iron is 26 and its oxidation number in the complex is +3.

$EAN = [26 - 2] + 2 \times 6$

$= 36$

Chelating ligands are at least bidentate ligands because they can "grab" a metal atom in two places.

As the number of rings in complex increases, stability of complex (chelate) also increases because the larger the number of ring closures to a metal atom, the more stable the compound.

Therefore, all the options are correct.

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