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Question:

K4[Fe(CN)6] is used on detecting Cu3+ ion, Fe3+ ion, Fe2+ ion, Cu+ ion

Cu3+ion

Fe3+ion

Cu+ion

Fe2+ion

Solution:

Fe3+ ion can be detected by K4[Fe(CN)6]
4Fe3+ + 3K4[Fe(CN)6] → Fe4[Fe(CN)6]3 + 12K+