03. ELECTROCHEMISTRY
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ELECTROCHEMISTRY

20007 Mark the false statement

1 A salt bridge is used to eliminate liquid junction potential
2 The Gibbs free energy change, \(\Delta G\) is related with electromotive force \((E)\), as \(\Delta G = - nFE\)
3 Nernst equation for single electrode potential is \(E = {E^o} - \frac{{RT}}{{nF}}\,\ln \,{a_{{M^{n + }}}}\)
4 The efficiency of a hydrogen oxygen fuel cell is \( 23\%\)
ELECTROCHEMISTRY

20008 The specific conductance of a \(0.1\,\,N \,KCl\) solution at \({23\,^o}C\) is \(0.012\,\,oh{m^{ - 1\,}}\,c{m^{ - 1}}\). The resistance of cell containing the solution at the same temperature was found to be \(55\,ohm\). The cell constant will be .............. \(\mathrm{cm}^{-1}\)

1 \(0.142\)
2 \(0.66\)
3 \(0.918\)
4 \(1.12\)
ELECTROCHEMISTRY

20009 Which of the following reactions occurs at the cathode of a common dry cell

1 \(Mn\, \to \,M{n^{2 + }} + 2{e^ - }\)
2 \(2Mn{O_2} + Z{n^{2 + }} + 2{e^ - }\, \to \,\,ZnM{n_2}{O_4}\)
3 \(2Zn{O_2} + M{n^{2 + }} + 2{e^ - }\, \to \,\,MnZ{n_2}{O_4}\)
4 \(Zn\, \to \,Z{n^{2 + }} + 2{e^ - }\)
ELECTROCHEMISTRY

20010 In \(Cu - Zn\) cell

1 Reduction occurs at the copper cathode
2 Oxidation occurs at the copper cathode
3 Reduction occurs at the anode
4 Chemical energy is converted to light energy
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ELECTROCHEMISTRY

20007 Mark the false statement

1 A salt bridge is used to eliminate liquid junction potential
2 The Gibbs free energy change, \(\Delta G\) is related with electromotive force \((E)\), as \(\Delta G = - nFE\)
3 Nernst equation for single electrode potential is \(E = {E^o} - \frac{{RT}}{{nF}}\,\ln \,{a_{{M^{n + }}}}\)
4 The efficiency of a hydrogen oxygen fuel cell is \( 23\%\)
ELECTROCHEMISTRY

20008 The specific conductance of a \(0.1\,\,N \,KCl\) solution at \({23\,^o}C\) is \(0.012\,\,oh{m^{ - 1\,}}\,c{m^{ - 1}}\). The resistance of cell containing the solution at the same temperature was found to be \(55\,ohm\). The cell constant will be .............. \(\mathrm{cm}^{-1}\)

1 \(0.142\)
2 \(0.66\)
3 \(0.918\)
4 \(1.12\)
ELECTROCHEMISTRY

20009 Which of the following reactions occurs at the cathode of a common dry cell

1 \(Mn\, \to \,M{n^{2 + }} + 2{e^ - }\)
2 \(2Mn{O_2} + Z{n^{2 + }} + 2{e^ - }\, \to \,\,ZnM{n_2}{O_4}\)
3 \(2Zn{O_2} + M{n^{2 + }} + 2{e^ - }\, \to \,\,MnZ{n_2}{O_4}\)
4 \(Zn\, \to \,Z{n^{2 + }} + 2{e^ - }\)
ELECTROCHEMISTRY

20010 In \(Cu - Zn\) cell

1 Reduction occurs at the copper cathode
2 Oxidation occurs at the copper cathode
3 Reduction occurs at the anode
4 Chemical energy is converted to light energy
NEET DIGITAL LIBRARY
ELECTROCHEMISTRY

20007 Mark the false statement

1 A salt bridge is used to eliminate liquid junction potential
2 The Gibbs free energy change, \(\Delta G\) is related with electromotive force \((E)\), as \(\Delta G = - nFE\)
3 Nernst equation for single electrode potential is \(E = {E^o} - \frac{{RT}}{{nF}}\,\ln \,{a_{{M^{n + }}}}\)
4 The efficiency of a hydrogen oxygen fuel cell is \( 23\%\)
ELECTROCHEMISTRY

20008 The specific conductance of a \(0.1\,\,N \,KCl\) solution at \({23\,^o}C\) is \(0.012\,\,oh{m^{ - 1\,}}\,c{m^{ - 1}}\). The resistance of cell containing the solution at the same temperature was found to be \(55\,ohm\). The cell constant will be .............. \(\mathrm{cm}^{-1}\)

1 \(0.142\)
2 \(0.66\)
3 \(0.918\)
4 \(1.12\)
ELECTROCHEMISTRY

20009 Which of the following reactions occurs at the cathode of a common dry cell

1 \(Mn\, \to \,M{n^{2 + }} + 2{e^ - }\)
2 \(2Mn{O_2} + Z{n^{2 + }} + 2{e^ - }\, \to \,\,ZnM{n_2}{O_4}\)
3 \(2Zn{O_2} + M{n^{2 + }} + 2{e^ - }\, \to \,\,MnZ{n_2}{O_4}\)
4 \(Zn\, \to \,Z{n^{2 + }} + 2{e^ - }\)
ELECTROCHEMISTRY

20010 In \(Cu - Zn\) cell

1 Reduction occurs at the copper cathode
2 Oxidation occurs at the copper cathode
3 Reduction occurs at the anode
4 Chemical energy is converted to light energy
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ELECTROCHEMISTRY

20007 Mark the false statement

1 A salt bridge is used to eliminate liquid junction potential
2 The Gibbs free energy change, \(\Delta G\) is related with electromotive force \((E)\), as \(\Delta G = - nFE\)
3 Nernst equation for single electrode potential is \(E = {E^o} - \frac{{RT}}{{nF}}\,\ln \,{a_{{M^{n + }}}}\)
4 The efficiency of a hydrogen oxygen fuel cell is \( 23\%\)
ELECTROCHEMISTRY

20008 The specific conductance of a \(0.1\,\,N \,KCl\) solution at \({23\,^o}C\) is \(0.012\,\,oh{m^{ - 1\,}}\,c{m^{ - 1}}\). The resistance of cell containing the solution at the same temperature was found to be \(55\,ohm\). The cell constant will be .............. \(\mathrm{cm}^{-1}\)

1 \(0.142\)
2 \(0.66\)
3 \(0.918\)
4 \(1.12\)
ELECTROCHEMISTRY

20009 Which of the following reactions occurs at the cathode of a common dry cell

1 \(Mn\, \to \,M{n^{2 + }} + 2{e^ - }\)
2 \(2Mn{O_2} + Z{n^{2 + }} + 2{e^ - }\, \to \,\,ZnM{n_2}{O_4}\)
3 \(2Zn{O_2} + M{n^{2 + }} + 2{e^ - }\, \to \,\,MnZ{n_2}{O_4}\)
4 \(Zn\, \to \,Z{n^{2 + }} + 2{e^ - }\)
ELECTROCHEMISTRY

20010 In \(Cu - Zn\) cell

1 Reduction occurs at the copper cathode
2 Oxidation occurs at the copper cathode
3 Reduction occurs at the anode
4 Chemical energy is converted to light energy
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