A) \[C{{r}^{+3}}\]
B) \[C{{r}_{2}}O_{7}^{2-}\]
C) \[MnO_{4}^{-}\]
D) \[MnO_{4}^{2-}\]
Correct Answer: B
Solution :
Dichromate ion \[(C{{r}_{2}}O_{7}^{2-})\] has orange colour. The colour of chromium ion\[(C{{r}^{3+}}),\] permaganate ion \[(MnO_{4}^{-})\] and maganate ion \[(MnO_{4}^{2-})\] are green, violet and green respectively.
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