निम्नलिखित सेलो की 298 K पर नसर्ट समीकरण एवं e.m.f. लिखिए -
(i) `Mg_((s))|Mg^(2+)(0.001M)||Cu^(2+)(0.0001M)|Cu_((s))`
(ii) `Fe_((s))|Fe^(2+)(0.001M)||H^(+)(1M)H_(2(g))(1bar)|Pt_((s))`
(iii) `Sn_((s))|Sn^(2+)(0.050M)||H^(+)(0.020M)|H_(2)(g)(1 bar)|Pt_((s))`
(iv) `Pt_((s))|Br_(2(l))|Br^(-)(0.010M)||H^(+)(0.030M)|H_(2(g))(1bar)|Pt_((s))`