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Q. The type of isomerism shown by $[Co(en)_{2}(NCS)_{2}]Cl$ and $[Co(en)_{2}(NCS)Cl]NCS$ is:

Coordination Compounds

Solution:

On ionization different species are formed to show ionization isomerism:
$[Co(en)_{2}(NCS)_{2}]Cl \rightleftharpoons [Co(en_{2})(NCS)_{2}]^{+} + Cl^{-}$
$[Co(en)_{2}(NCS)Cl]NCS \rightleftharpoons [Co(en)_{2}(NCS)CI]^{+} + NCS^{-}$