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Question

When concentrated HCl is added to an a queous solution of , its colour changes from reddish pink to deep blue. Which complex ion gives colour in this reaction?

A

B

C

D

Hard
JEE Mains

Solution

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Correct option is
B

When concentrated is added to an aqueous solution of , its colour changes from reddish pink to deep blue. is oxidized to .
This indicates the formation of .
.

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