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CHXII03:ELECTROCHEMISTRY

330071 Given: \({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.5}}\,\,{\rm{V}}\,\,{\rm{and}}\)
\({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 4}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.2}}\,\,{\rm{V,}}\,\,{\rm{then}}\,\,{\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 4}}}}}^{\rm{o}}\) is

1 0.3 V
2 0.1 V
3 1.7 V
4 2.1 V
KCET - 2019
CHXII03:ELECTROCHEMISTRY

330072 The standard oxidation potentials of Zn and Ag in water at \({\rm{25^\circ C}}\) are
\({\rm{Zn}}\left( {\rm{s}} \right) \to {\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{ + 2e}}\,\,\,\,\,\,\left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = 0}}{\rm{.76V}}} \right]\)
\({\rm{Ag}}\left( {\rm{s}} \right) \to {\rm{A}}{{\rm{g}}^{{\rm{2 + }}}}{\rm{ + e}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = - 0}}{\rm{.80}}\,\,{\rm{V}}} \right]\)
Which of the following reactions actually takes place?

1 \(Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( {aq} \right) \to Zn\left( s \right) + Ag\left( s \right)\)
2 \(Zn\left( s \right) + 2Ag\left( s \right) \to Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( s \right)\)
3 \(Z{n^{2 + }} + 2A{g^ + }\left( s \right) \to 2A{g^ + }\left( {aq} \right) + Zn\left( s \right)\)
4 \(Zn\left( s \right) + 2A{g^ + }\left( {aq} \right) \to Z{n^{2 + }} + 2Ag\left( s \right)\)
CHXII03:ELECTROCHEMISTRY

330073 When an electric current is passed through acidified water, 112 mL of hydrogen gas at N.T.P was collected at the cathode in 965 seconds. The current passed, in ampere, is:

1 \({\rm{2}}{\rm{.0}}\)
2 \({\rm{0}}{\rm{.1}}\)
3 \({\rm{0}}{\rm{.5}}\)
4 \({\rm{1}}{\rm{.0}}\)
JEE - 2018
CHXII03:ELECTROCHEMISTRY

330074 Which of the following statement is correct?

1 The absolute value of electrode potential cannot be determined.
2 According to IUPAC conventions, the standard electrode potential pertains to oxidation reactions only.
3 In SHE, the pressure of dihydrogen gas should be low and pH of solution should be zero
4 In the reaction \({{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{3}}} \to {\rm{2}}\,{{\rm{H}}_{\rm{2}}}{\rm{O + 2}}\,{{\rm{O}}_{\rm{2}}}\,\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\) is oxidised to \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
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CHXII03:ELECTROCHEMISTRY

330071 Given: \({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.5}}\,\,{\rm{V}}\,\,{\rm{and}}\)
\({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 4}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.2}}\,\,{\rm{V,}}\,\,{\rm{then}}\,\,{\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 4}}}}}^{\rm{o}}\) is

1 0.3 V
2 0.1 V
3 1.7 V
4 2.1 V
KCET - 2019
CHXII03:ELECTROCHEMISTRY

330072 The standard oxidation potentials of Zn and Ag in water at \({\rm{25^\circ C}}\) are
\({\rm{Zn}}\left( {\rm{s}} \right) \to {\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{ + 2e}}\,\,\,\,\,\,\left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = 0}}{\rm{.76V}}} \right]\)
\({\rm{Ag}}\left( {\rm{s}} \right) \to {\rm{A}}{{\rm{g}}^{{\rm{2 + }}}}{\rm{ + e}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = - 0}}{\rm{.80}}\,\,{\rm{V}}} \right]\)
Which of the following reactions actually takes place?

1 \(Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( {aq} \right) \to Zn\left( s \right) + Ag\left( s \right)\)
2 \(Zn\left( s \right) + 2Ag\left( s \right) \to Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( s \right)\)
3 \(Z{n^{2 + }} + 2A{g^ + }\left( s \right) \to 2A{g^ + }\left( {aq} \right) + Zn\left( s \right)\)
4 \(Zn\left( s \right) + 2A{g^ + }\left( {aq} \right) \to Z{n^{2 + }} + 2Ag\left( s \right)\)
CHXII03:ELECTROCHEMISTRY

330073 When an electric current is passed through acidified water, 112 mL of hydrogen gas at N.T.P was collected at the cathode in 965 seconds. The current passed, in ampere, is:

1 \({\rm{2}}{\rm{.0}}\)
2 \({\rm{0}}{\rm{.1}}\)
3 \({\rm{0}}{\rm{.5}}\)
4 \({\rm{1}}{\rm{.0}}\)
JEE - 2018
CHXII03:ELECTROCHEMISTRY

330074 Which of the following statement is correct?

1 The absolute value of electrode potential cannot be determined.
2 According to IUPAC conventions, the standard electrode potential pertains to oxidation reactions only.
3 In SHE, the pressure of dihydrogen gas should be low and pH of solution should be zero
4 In the reaction \({{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{3}}} \to {\rm{2}}\,{{\rm{H}}_{\rm{2}}}{\rm{O + 2}}\,{{\rm{O}}_{\rm{2}}}\,\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\) is oxidised to \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
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CHXII03:ELECTROCHEMISTRY

330071 Given: \({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.5}}\,\,{\rm{V}}\,\,{\rm{and}}\)
\({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 4}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.2}}\,\,{\rm{V,}}\,\,{\rm{then}}\,\,{\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 4}}}}}^{\rm{o}}\) is

1 0.3 V
2 0.1 V
3 1.7 V
4 2.1 V
KCET - 2019
CHXII03:ELECTROCHEMISTRY

330072 The standard oxidation potentials of Zn and Ag in water at \({\rm{25^\circ C}}\) are
\({\rm{Zn}}\left( {\rm{s}} \right) \to {\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{ + 2e}}\,\,\,\,\,\,\left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = 0}}{\rm{.76V}}} \right]\)
\({\rm{Ag}}\left( {\rm{s}} \right) \to {\rm{A}}{{\rm{g}}^{{\rm{2 + }}}}{\rm{ + e}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = - 0}}{\rm{.80}}\,\,{\rm{V}}} \right]\)
Which of the following reactions actually takes place?

1 \(Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( {aq} \right) \to Zn\left( s \right) + Ag\left( s \right)\)
2 \(Zn\left( s \right) + 2Ag\left( s \right) \to Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( s \right)\)
3 \(Z{n^{2 + }} + 2A{g^ + }\left( s \right) \to 2A{g^ + }\left( {aq} \right) + Zn\left( s \right)\)
4 \(Zn\left( s \right) + 2A{g^ + }\left( {aq} \right) \to Z{n^{2 + }} + 2Ag\left( s \right)\)
CHXII03:ELECTROCHEMISTRY

330073 When an electric current is passed through acidified water, 112 mL of hydrogen gas at N.T.P was collected at the cathode in 965 seconds. The current passed, in ampere, is:

1 \({\rm{2}}{\rm{.0}}\)
2 \({\rm{0}}{\rm{.1}}\)
3 \({\rm{0}}{\rm{.5}}\)
4 \({\rm{1}}{\rm{.0}}\)
JEE - 2018
CHXII03:ELECTROCHEMISTRY

330074 Which of the following statement is correct?

1 The absolute value of electrode potential cannot be determined.
2 According to IUPAC conventions, the standard electrode potential pertains to oxidation reactions only.
3 In SHE, the pressure of dihydrogen gas should be low and pH of solution should be zero
4 In the reaction \({{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{3}}} \to {\rm{2}}\,{{\rm{H}}_{\rm{2}}}{\rm{O + 2}}\,{{\rm{O}}_{\rm{2}}}\,\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\) is oxidised to \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
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CHXII03:ELECTROCHEMISTRY

330071 Given: \({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.5}}\,\,{\rm{V}}\,\,{\rm{and}}\)
\({\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 4}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 2}}}}}^{\rm{o}}{\rm{ = 1}}{\rm{.2}}\,\,{\rm{V,}}\,\,{\rm{then}}\,\,{\rm{E}}_{{\rm{M}}{{\rm{n}}^{{\rm{ + 7}}}}{\rm{/M}}{{\rm{n}}^{{\rm{ + 4}}}}}^{\rm{o}}\) is

1 0.3 V
2 0.1 V
3 1.7 V
4 2.1 V
KCET - 2019
CHXII03:ELECTROCHEMISTRY

330072 The standard oxidation potentials of Zn and Ag in water at \({\rm{25^\circ C}}\) are
\({\rm{Zn}}\left( {\rm{s}} \right) \to {\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{ + 2e}}\,\,\,\,\,\,\left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = 0}}{\rm{.76V}}} \right]\)
\({\rm{Ag}}\left( {\rm{s}} \right) \to {\rm{A}}{{\rm{g}}^{{\rm{2 + }}}}{\rm{ + e}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \left[ {{{\rm{E}}^{\rm{o}}}{\rm{ = - 0}}{\rm{.80}}\,\,{\rm{V}}} \right]\)
Which of the following reactions actually takes place?

1 \(Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( {aq} \right) \to Zn\left( s \right) + Ag\left( s \right)\)
2 \(Zn\left( s \right) + 2Ag\left( s \right) \to Z{n^{2 + }}\left( {aq} \right) + A{g^ + }\left( s \right)\)
3 \(Z{n^{2 + }} + 2A{g^ + }\left( s \right) \to 2A{g^ + }\left( {aq} \right) + Zn\left( s \right)\)
4 \(Zn\left( s \right) + 2A{g^ + }\left( {aq} \right) \to Z{n^{2 + }} + 2Ag\left( s \right)\)
CHXII03:ELECTROCHEMISTRY

330073 When an electric current is passed through acidified water, 112 mL of hydrogen gas at N.T.P was collected at the cathode in 965 seconds. The current passed, in ampere, is:

1 \({\rm{2}}{\rm{.0}}\)
2 \({\rm{0}}{\rm{.1}}\)
3 \({\rm{0}}{\rm{.5}}\)
4 \({\rm{1}}{\rm{.0}}\)
JEE - 2018
CHXII03:ELECTROCHEMISTRY

330074 Which of the following statement is correct?

1 The absolute value of electrode potential cannot be determined.
2 According to IUPAC conventions, the standard electrode potential pertains to oxidation reactions only.
3 In SHE, the pressure of dihydrogen gas should be low and pH of solution should be zero
4 In the reaction \({{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}{\rm{ + }}{{\rm{O}}_{\rm{3}}} \to {\rm{2}}\,{{\rm{H}}_{\rm{2}}}{\rm{O + 2}}\,{{\rm{O}}_{\rm{2}}}\,\,{{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\) is oxidised to \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
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