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The spontaneous redox reaction//s among ...

The spontaneous redox reaction`//s` among the follow is`//` are
`(a)` `2Fe^(3+)+Fe rarr 3Fe^(++)`
`(b)Hg_(2)^(++) rarr Hg^(++)+Hg`
`(c )` `3AgCl+NO+2H_(2)O rarr 3Ag+3Cl^(-)+NO_(3)^(-)+4H^(+)`
Given that
`E_(Fe(+++)//Fe^(++))^(.)=0.77V" "E_(Fe^(++)//Fe)^(.)=-0.44V`
`E_(Hg^(+-)//Hg)^(.)=0.85V" "E_(Hg^(++)//Hg_(2))^(.)=0.92V`
`E_(AgCl//Ag)^(.)=0.22V " "E_(NO_(3)//NO)^(.)=0.96V`

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