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(Zn left(s right)/Zn^ 2+ left(aq right) E degree=+0.76V ) (Fe left(s right)/Fe^ 2+ left(aq right) E degree=+0.44V ) (Cu left(s right)/Cu^ 2+ left(aq right) E degree=-0.34V ) তড়িৎদ | Suva Ai