A) \[[Co({{H}_{2}}O)]C{{l}_{2}}\]
B) \[[Co{{({{H}_{2}}O)}_{2}}]C{{l}_{4}}{{]}^{2-}}\]
C) \[{{[CoC{{l}_{4}}]}^{2-}}\]
D) \[[Co{{({{H}_{2}}O)}_{2}}C{{l}_{2}}]\]
Correct Answer: C
Solution :
\[CoC{{l}_{2}}\], a weak Lewis acid, reacts with chloride ion to produce salt containing the tetrahedral, \[{{[CoC{{l}_{4}}]}^{2-}}\] ion. It is blue when anhydrous and a deep magenta colour when hydrared, for this reason it is widely used as an indicator for water.
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