Questions
An aqueous solution of CoCl2 on addition of excess of concentrated HCI turns blue due to formation of
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a
CoH2O4Cl2
b
CoH2O2Cl42−
c
CoCl42−
d
CoH2O2Cl2
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Correct option is C
CoCl2 is a weak Lewis acid, reacting with chloride ion to produce salt containing the tetrahedral [CoCl4]2- ion. CoCl2 is blue when anhydrous, and a deep magenta colour when hydrated, for this reason it is widely used as an indicator for water.Similar Questions
Complex salt can be made by the combination of with
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