CBSE Class 12 · 2001 · All India Compartment · Coordination CompoundsShort Answer

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a) Name two main factors that favour a metal ion forming a complex.
b) Give an example of an industrial application of the formation of a coordination complex.
c) Write the IUPAC name of [Co(en)

_{2}

Cl(ONO)]

^{+}

Solution

(a) Complex formation is favoured by:

a high charge-to-size ratio of the metal ion (small, highly charged ions attract ligands strongly);
vacant orbitals of suitable energy (the (n−1)d orbitals) to accept ligand lone pairs.

(b) Industrial application: extraction of gold and silver — the metal is leached with NaCN as the soluble complex [Au(CN)

_{2}

]

^{-}

and then displaced by zinc (hydrometallurgy).
(c) Alphabetical order (chlorido, ethane-1,2-diamine, nitrito-O); (−1)+(−1)+x = +1 ⇒ Co(III):
\textbf{chloridobis(ethane-1,2-diamine)nitrito-O-cobalt(III) ion}

CBSE Class 12 Board · 2001 · All India Compartment · Subjective

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CBSE Class 12 · 2001 · All India Compartment · Coordination CompoundsShort Answer

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