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Q.
Turnbulls blue is a compound
AMUAMU 2000
Solution:
A blue colour is produced when $Fe ^{2+}$, reacts with $K _{3}\left[ Fe ( CN )_{6}\right]$ potassium ferricyanide.
This blue colour is called Turnbull's blue.
So, Turnull's blue is ferrous ferricyanide.
