Fuel Cells
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CHXII03:ELECTROCHEMISTRY

330315 With respect to \({{\rm{H}}_{\rm{2}}}{\rm{ - }}{{\rm{O}}_{\rm{2}}}\) fuel cell the correct statement is

1 Electrolyte used is pure \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 Heat of combustion is directly converted to electrical energy.
3 \({{\rm{O}}_{\rm{2}}}\) gas gets oxidised to \({{\rm{O}}_{\rm{3}}}\) in the cell.
4 Overall reaction in the cell is \({\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{2}}} \to {\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXII03:ELECTROCHEMISTRY

330295 Which of the following reaction is used to make a fuel cell?

1 \({\text{Cd(s) + 2Ni(OH}}{{\text{)}}_{\text{3}}}{\text{(}}\;{\text{s)}} \to \)
\({\text{CdO(s) + 2Ni(OH}}{{\text{)}}_{\text{2}}}{\text{(}} {\text{s) + }}{{\text{H}}_{\text{2}}}{\text{O(l)}}\)
2 \({\text{Pb(s) + Pb}}{{\text{O}}_{\text{2}}}{\text{(}}\;{\text{s) + 2}}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{(aq) }} \to \)
\({\text{2PbS}}{{\text{O}}_{\text{4}}}{\text{(}} {\text{s) + 2}}{{\text{H}}_{\text{2}}}{\text{O(l)}}\)
3 \({\text{2}}{{\text{H}}_{\text{2}}}{\text{(g) + }}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}\,\,\,\,\,\,\,\,\,\,{\text{(1)}}\)
4 \[\begin{gathered}
{\text{2Fe(s) + }}{{\text{O}}_{\text{2}}}{\text{(g) + 4}}{{\text{H}}^{{\text{ + }}}}{\text{(aq)}} \to \hfill \\
{\text{2F}}{{\text{e}}^{{\text{2 + }}}}{\text{(aq) + 2}}{{\text{H}}_{\text{2}}}{\text{O}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{(2)}} \hfill \\
\end{gathered} \]
AIIMS - 2013
CHXII03:ELECTROCHEMISTRY

330296 Standard free energies of formation (in kJ/mol) at 298 K are \({\rm{ - 237}}{\rm{.2, - 394}}{\rm{.4 and - 8}}{\rm{.2}}\) for \({{\rm{H}}_{\rm{2}}}{\rm{O(l),}}\,\,{\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}\) and pentane(g), respectively. The value of \({\rm{E}}_{cell}^o\) for the pentane-oxygen fuelcell is

1 0.0968 V
2 2.0968 V
3 1.0968 V
4 1.968 V
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CHXII03:ELECTROCHEMISTRY

330315 With respect to \({{\rm{H}}_{\rm{2}}}{\rm{ - }}{{\rm{O}}_{\rm{2}}}\) fuel cell the correct statement is

1 Electrolyte used is pure \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 Heat of combustion is directly converted to electrical energy.
3 \({{\rm{O}}_{\rm{2}}}\) gas gets oxidised to \({{\rm{O}}_{\rm{3}}}\) in the cell.
4 Overall reaction in the cell is \({\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{2}}} \to {\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXII03:ELECTROCHEMISTRY

330295 Which of the following reaction is used to make a fuel cell?

1 \({\text{Cd(s) + 2Ni(OH}}{{\text{)}}_{\text{3}}}{\text{(}}\;{\text{s)}} \to \)
\({\text{CdO(s) + 2Ni(OH}}{{\text{)}}_{\text{2}}}{\text{(}} {\text{s) + }}{{\text{H}}_{\text{2}}}{\text{O(l)}}\)
2 \({\text{Pb(s) + Pb}}{{\text{O}}_{\text{2}}}{\text{(}}\;{\text{s) + 2}}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{(aq) }} \to \)
\({\text{2PbS}}{{\text{O}}_{\text{4}}}{\text{(}} {\text{s) + 2}}{{\text{H}}_{\text{2}}}{\text{O(l)}}\)
3 \({\text{2}}{{\text{H}}_{\text{2}}}{\text{(g) + }}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}\,\,\,\,\,\,\,\,\,\,{\text{(1)}}\)
4 \[\begin{gathered}
{\text{2Fe(s) + }}{{\text{O}}_{\text{2}}}{\text{(g) + 4}}{{\text{H}}^{{\text{ + }}}}{\text{(aq)}} \to \hfill \\
{\text{2F}}{{\text{e}}^{{\text{2 + }}}}{\text{(aq) + 2}}{{\text{H}}_{\text{2}}}{\text{O}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{(2)}} \hfill \\
\end{gathered} \]
AIIMS - 2013
CHXII03:ELECTROCHEMISTRY

330296 Standard free energies of formation (in kJ/mol) at 298 K are \({\rm{ - 237}}{\rm{.2, - 394}}{\rm{.4 and - 8}}{\rm{.2}}\) for \({{\rm{H}}_{\rm{2}}}{\rm{O(l),}}\,\,{\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}\) and pentane(g), respectively. The value of \({\rm{E}}_{cell}^o\) for the pentane-oxygen fuelcell is

1 0.0968 V
2 2.0968 V
3 1.0968 V
4 1.968 V
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CHXII03:ELECTROCHEMISTRY

330315 With respect to \({{\rm{H}}_{\rm{2}}}{\rm{ - }}{{\rm{O}}_{\rm{2}}}\) fuel cell the correct statement is

1 Electrolyte used is pure \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 Heat of combustion is directly converted to electrical energy.
3 \({{\rm{O}}_{\rm{2}}}\) gas gets oxidised to \({{\rm{O}}_{\rm{3}}}\) in the cell.
4 Overall reaction in the cell is \({\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{2}}} \to {\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
CHXII03:ELECTROCHEMISTRY

330295 Which of the following reaction is used to make a fuel cell?

1 \({\text{Cd(s) + 2Ni(OH}}{{\text{)}}_{\text{3}}}{\text{(}}\;{\text{s)}} \to \)
\({\text{CdO(s) + 2Ni(OH}}{{\text{)}}_{\text{2}}}{\text{(}} {\text{s) + }}{{\text{H}}_{\text{2}}}{\text{O(l)}}\)
2 \({\text{Pb(s) + Pb}}{{\text{O}}_{\text{2}}}{\text{(}}\;{\text{s) + 2}}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{(aq) }} \to \)
\({\text{2PbS}}{{\text{O}}_{\text{4}}}{\text{(}} {\text{s) + 2}}{{\text{H}}_{\text{2}}}{\text{O(l)}}\)
3 \({\text{2}}{{\text{H}}_{\text{2}}}{\text{(g) + }}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}\,\,\,\,\,\,\,\,\,\,{\text{(1)}}\)
4 \[\begin{gathered}
{\text{2Fe(s) + }}{{\text{O}}_{\text{2}}}{\text{(g) + 4}}{{\text{H}}^{{\text{ + }}}}{\text{(aq)}} \to \hfill \\
{\text{2F}}{{\text{e}}^{{\text{2 + }}}}{\text{(aq) + 2}}{{\text{H}}_{\text{2}}}{\text{O}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{(2)}} \hfill \\
\end{gathered} \]
AIIMS - 2013
CHXII03:ELECTROCHEMISTRY

330296 Standard free energies of formation (in kJ/mol) at 298 K are \({\rm{ - 237}}{\rm{.2, - 394}}{\rm{.4 and - 8}}{\rm{.2}}\) for \({{\rm{H}}_{\rm{2}}}{\rm{O(l),}}\,\,{\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{(g)}}\) and pentane(g), respectively. The value of \({\rm{E}}_{cell}^o\) for the pentane-oxygen fuelcell is

1 0.0968 V
2 2.0968 V
3 1.0968 V
4 1.968 V
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