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State with reason whether the following ...

State with reason whether the following reaction is spontaneous or not : `Sn^(2+)+2Fe^(3+)rarr Sn^(4+)+2Fe^(2+)`
`["Given, "E_(Fe^(3+)|Fe^(2+))^(@)=+0.77V, E_(Sn^(4+)|Sn^(2+))^(@)=+0.15V]`

Text Solution

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In the reaction, `Sn^(2+)` undergoes oxidation `(Sn^(2+)rarr Sn^(4+))` and `Fe^(3+)` undergoes reduction `(Fe^(3+)rarrFe^(2+))`. The anode and the cathode of the galvanic cell in which the given reaction occurs and `Sn^(4+), Sn^(2+)|Pt` and `Fe^(3+),Fe^(2+)|Pt`, respectively. For this cell, `E_("cell")^(@)=E_("cathode")^(@)-E_("anode")^(@)=E_(Fe^(3+)|Fe^(2+))^(@)-E_(Zn^(4+)|Sn^(2+))^(@)`
`=-0.77V-0.15V=0.62V`
As, `E_("cell")^(@) gt 0`, the reaction will occur spontaneously.
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