JEE Main & Advanced Sample Paper JEE Main Sample Paper-45

Direction: The dissociation of complex may be expressed as \[{{[M{{L}_{x}}]}^{4+}}\,+xL\] and equilibrium constant of this is known as instability constant which is a measure of stability. The stability of complex depends on EAN of central atom, charge on metalion, basic nature of ligand and chelation.

The EAN of \[Co\] in \[Co{{(CO)}_{4}}\] is 35 and it is less stable. It attains stability by

A) oxidation of Co

B) reduction of Co

C) dimerization

D) tetramerization

Correct Answer: C

Solution :

\[C{{O}_{2}}\,{{(CO)}_{8}}\] is most stable. Thus, \[CO\,{{(CO)}_{4}}\] attains stability by dimerisation.