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Write half cell reactions and balanced c...

Write half cell reactions and balanced chemical equations for the following galvanic cells.
(a) `Zn(s) |Zn^(2+)(aq)||Cr^(3+)(aq)|Cr(s)`.
(b) `Pb(s),|PbSO_(4)(s)|HSO_(4)^(-)(aq),H^(+)(aq)||H^(+)(aq),HSO_(4)^(-)(aq)|PbO_(2)(s),PbSO_(4)(s)`.
(c ) `Mg(s)|Mg^(2+)(aq)||Sn^(2+)(aq)|Sn(s)`.

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