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Q.

An aqueous solution of CoCl₂, on addition of excess of concentrated HCI turns blue due to the formation of

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a

$[Co {(H_{2} O)}_{4} {Cl}_{2}]$

b

${[Co {(H_{2} O)}_{2} {Cl}_{4}]}^{2 -}$

c

${[{CoCl}_{4}]}^{2 -}$

d

${[Co {(H_{2} O)}_{2} Cl]}_{2}$

answer is C.

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Detailed Solution

CoCl₂ is a weak Lewis acid, reacting with chloride ion to produce salt containing the tetrahedral [CoCl₄]^2- ion.
CoCl₂is blue when anhydrous, and has a deep magenta color when hydrated.
For this reason, it is widely used as an indicator for water.

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An aqueous solution of CoCl2, on addition of excess of concentrated HCI turns blue due to the formation of