A) \[C{{u}^{2+}}\]
B) \[F{{e}^{2+}}\]
C) \[Z{{n}^{2+}}\]
D) \[C{{o}^{2+}}\]
Correct Answer: D
Solution :
A pink coloured salt terms blue on heating in the presence of \[C{{O}^{2+}}\]
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