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Write the Nernst equation and emf of the...

Write the Nernst equation and emf of the following cells at 298 K:
(i) `Mg(s)|Mg^(2+) (0.001M)|Cu^(2+)(0.0001 M)|Cu(s)`
(ii) `Fe(s)|Fe^(2+)(0.001M)|H^(+) (1M)|H_(2)(g) (1bar) | Pt(s)`
(iii) `Sn(s)|Sn^(2+) (0.050 M)|H^(+)(0.020 M)|H_(2)(g) (1 "bar" )|Pt(s)`
(iv) `Pt(s) |Br_(2)(l) |Br^(-)(0.010 M) |H^(+)(0.030 M)|H_(2)(g) (1 "bar"))|Pt(s)`.

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