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Q. Which of the following ion in aqueous medium has orange colour?

JIPMERJIPMER 1996

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.