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(1) It can be seen from the experimental schemes of A and B that although silver can be obtained in both schemes, copper in the mixture obtained in Scheme A is not easy to remove, while iron in the mixture obtained in Scheme B can be removed by reacting with hydrochloric acid or sulfuric acid.

(2) In the first step of the experimental scheme, metallic iron is added to the fixed solution, and after the reaction is complete, silver-iron mixture and ferrous nitrate solution are obtained by filtration, and then a proper amount of dilute hydrochloric acid or dilute sulfuric acid is added to the solid mixture to obtain solution B, namely FeCl2 _ 2 solution (or FeSO4 _ 4 solution).

(3) Magnetic attraction or reaction with acid can be used to generate gas.

So the answer is: (1) 1b; It is convenient to separate the metal mixture. ② dilute HCl (or dilute sulfuric acid); Fe+2HCl═FeCl2+H2↑ (or Fe+H2SO4═FeSO4+H2↑)

(2) filtering; Funnel; Ferric chloride (or ferrous sulfate). (3) Add dilute HCl into the obtained product and observe whether bubbles appear.