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The method in the attachment is called as Electrolysis.
This process is done to Copper for refining the copper metal from impurities.
( a ) Metals used are both Copper. The electrode used in Cathod is the Pure Copper and that used in Anode is the Impure Copper
=> Electrode A = Pure Copper ; Electrode B = Impure Copper
( b ) The process illustrated is called as Electrolysis. It is also called as Electrolytic Refining of metals.
( c ) The solution used must be an electrolyte and a good conductor with proper composition of Copper salts. Hence the solution used here is Blue coloured Copper Sulphate solution having a formula CuSO₄.
Hope my answer helped you.
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