The cell reaction of the galvanic cell ${\rm{Cu}}\left( s \right)\left| {{\rm{C}}{{\rm{u}}^{2 + }}\left( {aq} \right)} \right|\left| {{\rm{H}}{{\rm{g}}^{2 + }}\left( {aq} \right)} \right|{\rm{Hg}}\left( l \right)$ is

${\rm{Cu}} + {\rm{H}}{{\rm{g}}^{2 + }} \to {\rm{C}}{{\rm{u}}^{2 + }} + {\rm{Hg}}$

${\rm{Hg}} + {\rm{C}}{{\rm{u}}^{2 + }} \to {\rm{H}}{{\rm{g}}^{2 + }} + {\rm{Cu}}$

${\rm{Hg}} + {\rm{C}}{{\rm{u}}^{2 + }} \to {\rm{C}}{{\rm{u}}^ + } + {\rm{H}}{{\rm{g}}^ + }$

${\rm{Cu}} + {\rm{Hg}} \to {\rm{CuHg}}$

NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

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Understanding +4 | -1

The cell reaction of the galvanic cell

\mathrm{Cu}\left( s \right)\left| {\mathrm{C}{\mathrm{u}^{2 + }}\left( {aq} \right)} \right|\left| {\mathrm{H}{\mathrm{g}^{2 + }}\left( {aq} \right)} \right|\mathrm{Hg}\left( l \right)

View answer and explanation

Correct option: D

\mathrm{Cu} + \mathrm{H}{\mathrm{g}^{2 + }} \to \mathrm{C}{\mathrm{u}^{2 + }} + \mathrm{Hg}

Option D (

\mathrm{Cu} + \mathrm{H}{\mathrm{g}^{2 + }} \to \mathrm{C}{\mathrm{u}^{2 + }} + \mathrm{Hg}

) is correct because copper is oxidized to

Cu^{2+}

and

Hg^{2+}

is reduced to Hg.