Published by:
CGP EDU Academic Team
Published on: August 14, 2026
When concentrated 
is added to an aqueous solution of 
, its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Aqueous solution of 
contains 
which is pinkish in colour so option is incorrect.
Reduction potential of 
is high so option(b) is incorrect. 
does not oxidises easily to 
.
It is general case that symmetrical substituted octahedral complexes are less deeper in colour than tetrahedral complexes. 
is deep blue in colour.
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