निम्नलिखित सेलों की 298 K पर नेर्नस्ट समीकरण एवं emf लिखिए ।
(i) ` Mg(s)|Mg^(2+)(0.001 M)||Cu^(2+)(0.001M)|Cu(s)`
(ii) `Fe(s)|Fe^(2+)(0.001 M)||H^(+)(1M) | H_(2)(g)1"bar" |Pt(s)`
(ii) `Sn(s)|Sn^(2+)(0.050M)||H^(+)(0.020M)|H_(2)(g)(1"bar")|Pt(s)`
(iv) `Pt(s)|Br^(-)(0.010M)|Br_(2)(l)||H^(+)(0.030M)|H_(2)(g)(1"bar")|Pt(s)`.

Answer

`(i) 2.68 v, (ii) 0.53 V, (iii) 0.08 V, (iv)-1.289 V`