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In an electrochemical reaction of lead, ...

In an electrochemical reaction of lead, at standard temperatureif `E^@_((Pb)^2+//(Pb))=m`Volt and`E^@_((Pb)^4+//(Pb))=n` Volt,then the value of `E^@_(Pb^(2+)//Pb^(4+))=n` is given by m-xn.The value of x is (Nearest integer)

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