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( Pt left(H_ 2 , 1 ~atm right) left|HCl left(sol^ n right) right| left|CuSO_ 4 left(sol^ n right) right| Cu ) কোষের ( E^ 0 ) এর মান ( 0.337 ~V ) হলে ( Delta G_ f left(Cu^ 2+ , ag r | Suva Ai