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Find total number of process which has p...

Find total number of process which has positive value of standard electrode potential.
`E_(Fe|Fe^(2+))^(0),E_(Cu|Cu^(2+))^(0),E_(Zn^(2+)|Zn)^(0),E_(Mg^(2+)|Mg)^(0),E_(Sn|Sn^(2+))^(0),E_(Cr|Cr^(3+))^(0),E_(Ag|Ag^(+))^(0)`

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The correct Answer is:
3
`(Fe)/(Fe^(2+)),(Sn)/(Sn^(2+)),(Cr)/(Cr^(3+))` shows positive value of standard electrode potential.
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