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Adding iron powder and copper powder into a beaker containing FeCl _ 3 solution, iron can react with ferric chloride to generate ferrous chloride, copper can react with ferric chloride to generate ferrous chloride and copper, and iron can react with generated copper chloride to generate ferrous chloride and copper.

A, adding a mixture of iron and copper, iron reacts with ferric chloride first, and it is possible that all iron reacts and copper remains, so A is correct;

B, if the amount of ferric chloride is small, the added iron powder and copper powder may remain, so B is correct;

C, adding a mixture of iron and copper, iron reacts with ferric chloride first, and copper participates in the reaction, so there will be no iron without copper, so C is wrong;

D, if the amount of ferric chloride is large, all the added iron powder and copper powder participate in the reaction, and there will be no surplus, so D is correct.

So choose C.

Comments: This topic examines the application of metal activity sequence, which can be completed according to the metal activity sequence and its significance.