1.

In which of the following electrochemical cell, overall cell reaction is : HgO (s) + H_2 (g) rarr Hg E + H_2O(e ).

Answer»

`Pt | H_2 (g) | H^(+) (aq) |HgO(s) |Hg|Hg€ | Pt`
`Pt|H_2(g) |NaOH (aq) |HgO (s) |HGE |Pt`
`Pt | H_2(g) |H^(+) ||NaOH(aq)| HgO(s) |Hg € |Pt`
` Pt |H-2 (g) |H^(+) ||HgO(s) |Hg€ |Pt`

SOLUTION :` Pt | H_2 (g) | NaOH (aq) | HgO (s) | Hg (l) Pt1`
` LHE` reaction : ` H_2 (g) + 2 OH^(-) H_2O (l) _2e`
` RARR Hg (l) 2OH^(-)`
NET cell reaction : ` HgO (s) + H_2 (g) rarr Hg (l) +H_2 O`.


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