A) \[{{[CoC{{l}_{4}}]}^{2-}}\]
B) \[{{[CoC{{l}_{6}}]}^{3-}}\]
C) \[{{[CoC{{l}_{6}}]}^{4-}}\]
D) \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
Correct Answer: A
Solution :
[a] Aqueous of solution of \[CoC{{l}_{2}}\] contains \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\] which is pinkish in colour so option [d] is incorrect. Reduction potential of \[C{{o}^{3+}}\xrightarrow{{}}C{{o}^{2+}}\] is high so option[b] is incorrect. \[C{{o}^{2+}}\] does not oxidises easily to \[C{{o}^{3+}}\]. It is general case that symmetrical substituted octahedral complexes are less deeper in colour than tetrahedral complexes. So \[{{[CoC{{l}_{4}}]}^{2-}}\] is deep blue in colour.
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