Electrochemical Series and Applications
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CHXII03:ELECTROCHEMISTRY

330107 Beryllium is placed above magnesium in the II group. Beryllium dust, therefore, when added to \({\rm{MgC}}{{\rm{l}}_{\rm{2}}}\) solution will

1 Have no effect
2 Precipitate Mg metal
3 Precipitate MgO
4 Lead to dissolution of Be metal
CHXII03:ELECTROCHEMISTRY

330108 Assertion :
Zinc displaces copper from copper sulphate solution.
Reason :
\(\mathrm{E}^{\circ}\) of zinc is \(-0.76 \mathrm{~V}\) and that of copper is \(+0.34 \mathrm{~V}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330109 The standard reduction potentials of
\(\mathrm{Cu}^{+2}, \mathrm{Ag}^{+}, \mathrm{Hg}^{+2}\) and \(\mathrm{Mg}^{+2}\) are \(0.34 \mathrm{~V},+0.80 \mathrm{~V}\), \(+0.79 \mathrm{~V}\) and \(-2.37 \mathrm{~V}\) respectively. With increasing voltage, the sequence of deposition of metals on the cathode from a molten mixture containing all those ions is

1 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Cu}\)
2 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag}, \mathrm{Mg}\)
3 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Cu}, \mathrm{Mg}\)
4 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Ag}\)
CHXII03:ELECTROCHEMISTRY

330110 Assertion :
Auric chloride \(\left(\mathrm{AuCl}_{3}\right)\) solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin.
Reason :
Gold is a very precious metal.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330111 At 298 K, the standard electrode potentials of \({\rm{C}}{{\rm{u}}^{{\rm{2 + }}}}{\rm{/Cu,}}\,\,{\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{/Zn,}}\,\,{\rm{F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{/Fe}}\,\,{\rm{and}}\,\,{\rm{A}}{{\rm{g}}^{\rm{ + }}}{\rm{/Ag}}\) \({\rm{are}}\,\,{\rm{0}}{\rm{.34V,}}\,\,{\rm{ - 0}}{\rm{.76}}\,\,{\rm{V,}}\,\,{\rm{ - 0}}{\rm{.44}}\,\,{\rm{V}}\,\,{\rm{and}}\,\,{\rm{0}}{\rm{.80}}\,\,{\rm{V}}\), respectively.
On the basis of standard electrode potential, predict which of the following reaction can not occur ?

1 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}} \to {\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
2 \({\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}}\)
3 \({\rm{2CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + 2Ag(s)}} \to {\rm{2Cu(s) + A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}{\rm{(aq)}}\)
4 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
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CHXII03:ELECTROCHEMISTRY

330107 Beryllium is placed above magnesium in the II group. Beryllium dust, therefore, when added to \({\rm{MgC}}{{\rm{l}}_{\rm{2}}}\) solution will

1 Have no effect
2 Precipitate Mg metal
3 Precipitate MgO
4 Lead to dissolution of Be metal
CHXII03:ELECTROCHEMISTRY

330108 Assertion :
Zinc displaces copper from copper sulphate solution.
Reason :
\(\mathrm{E}^{\circ}\) of zinc is \(-0.76 \mathrm{~V}\) and that of copper is \(+0.34 \mathrm{~V}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330109 The standard reduction potentials of
\(\mathrm{Cu}^{+2}, \mathrm{Ag}^{+}, \mathrm{Hg}^{+2}\) and \(\mathrm{Mg}^{+2}\) are \(0.34 \mathrm{~V},+0.80 \mathrm{~V}\), \(+0.79 \mathrm{~V}\) and \(-2.37 \mathrm{~V}\) respectively. With increasing voltage, the sequence of deposition of metals on the cathode from a molten mixture containing all those ions is

1 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Cu}\)
2 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag}, \mathrm{Mg}\)
3 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Cu}, \mathrm{Mg}\)
4 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Ag}\)
CHXII03:ELECTROCHEMISTRY

330110 Assertion :
Auric chloride \(\left(\mathrm{AuCl}_{3}\right)\) solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin.
Reason :
Gold is a very precious metal.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330111 At 298 K, the standard electrode potentials of \({\rm{C}}{{\rm{u}}^{{\rm{2 + }}}}{\rm{/Cu,}}\,\,{\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{/Zn,}}\,\,{\rm{F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{/Fe}}\,\,{\rm{and}}\,\,{\rm{A}}{{\rm{g}}^{\rm{ + }}}{\rm{/Ag}}\) \({\rm{are}}\,\,{\rm{0}}{\rm{.34V,}}\,\,{\rm{ - 0}}{\rm{.76}}\,\,{\rm{V,}}\,\,{\rm{ - 0}}{\rm{.44}}\,\,{\rm{V}}\,\,{\rm{and}}\,\,{\rm{0}}{\rm{.80}}\,\,{\rm{V}}\), respectively.
On the basis of standard electrode potential, predict which of the following reaction can not occur ?

1 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}} \to {\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
2 \({\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}}\)
3 \({\rm{2CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + 2Ag(s)}} \to {\rm{2Cu(s) + A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}{\rm{(aq)}}\)
4 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
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CHXII03:ELECTROCHEMISTRY

330107 Beryllium is placed above magnesium in the II group. Beryllium dust, therefore, when added to \({\rm{MgC}}{{\rm{l}}_{\rm{2}}}\) solution will

1 Have no effect
2 Precipitate Mg metal
3 Precipitate MgO
4 Lead to dissolution of Be metal
CHXII03:ELECTROCHEMISTRY

330108 Assertion :
Zinc displaces copper from copper sulphate solution.
Reason :
\(\mathrm{E}^{\circ}\) of zinc is \(-0.76 \mathrm{~V}\) and that of copper is \(+0.34 \mathrm{~V}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330109 The standard reduction potentials of
\(\mathrm{Cu}^{+2}, \mathrm{Ag}^{+}, \mathrm{Hg}^{+2}\) and \(\mathrm{Mg}^{+2}\) are \(0.34 \mathrm{~V},+0.80 \mathrm{~V}\), \(+0.79 \mathrm{~V}\) and \(-2.37 \mathrm{~V}\) respectively. With increasing voltage, the sequence of deposition of metals on the cathode from a molten mixture containing all those ions is

1 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Cu}\)
2 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag}, \mathrm{Mg}\)
3 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Cu}, \mathrm{Mg}\)
4 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Ag}\)
CHXII03:ELECTROCHEMISTRY

330110 Assertion :
Auric chloride \(\left(\mathrm{AuCl}_{3}\right)\) solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin.
Reason :
Gold is a very precious metal.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330111 At 298 K, the standard electrode potentials of \({\rm{C}}{{\rm{u}}^{{\rm{2 + }}}}{\rm{/Cu,}}\,\,{\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{/Zn,}}\,\,{\rm{F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{/Fe}}\,\,{\rm{and}}\,\,{\rm{A}}{{\rm{g}}^{\rm{ + }}}{\rm{/Ag}}\) \({\rm{are}}\,\,{\rm{0}}{\rm{.34V,}}\,\,{\rm{ - 0}}{\rm{.76}}\,\,{\rm{V,}}\,\,{\rm{ - 0}}{\rm{.44}}\,\,{\rm{V}}\,\,{\rm{and}}\,\,{\rm{0}}{\rm{.80}}\,\,{\rm{V}}\), respectively.
On the basis of standard electrode potential, predict which of the following reaction can not occur ?

1 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}} \to {\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
2 \({\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}}\)
3 \({\rm{2CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + 2Ag(s)}} \to {\rm{2Cu(s) + A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}{\rm{(aq)}}\)
4 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
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CHXII03:ELECTROCHEMISTRY

330107 Beryllium is placed above magnesium in the II group. Beryllium dust, therefore, when added to \({\rm{MgC}}{{\rm{l}}_{\rm{2}}}\) solution will

1 Have no effect
2 Precipitate Mg metal
3 Precipitate MgO
4 Lead to dissolution of Be metal
CHXII03:ELECTROCHEMISTRY

330108 Assertion :
Zinc displaces copper from copper sulphate solution.
Reason :
\(\mathrm{E}^{\circ}\) of zinc is \(-0.76 \mathrm{~V}\) and that of copper is \(+0.34 \mathrm{~V}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330109 The standard reduction potentials of
\(\mathrm{Cu}^{+2}, \mathrm{Ag}^{+}, \mathrm{Hg}^{+2}\) and \(\mathrm{Mg}^{+2}\) are \(0.34 \mathrm{~V},+0.80 \mathrm{~V}\), \(+0.79 \mathrm{~V}\) and \(-2.37 \mathrm{~V}\) respectively. With increasing voltage, the sequence of deposition of metals on the cathode from a molten mixture containing all those ions is

1 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Cu}\)
2 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag}, \mathrm{Mg}\)
3 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Cu}, \mathrm{Mg}\)
4 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Ag}\)
CHXII03:ELECTROCHEMISTRY

330110 Assertion :
Auric chloride \(\left(\mathrm{AuCl}_{3}\right)\) solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin.
Reason :
Gold is a very precious metal.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330111 At 298 K, the standard electrode potentials of \({\rm{C}}{{\rm{u}}^{{\rm{2 + }}}}{\rm{/Cu,}}\,\,{\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{/Zn,}}\,\,{\rm{F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{/Fe}}\,\,{\rm{and}}\,\,{\rm{A}}{{\rm{g}}^{\rm{ + }}}{\rm{/Ag}}\) \({\rm{are}}\,\,{\rm{0}}{\rm{.34V,}}\,\,{\rm{ - 0}}{\rm{.76}}\,\,{\rm{V,}}\,\,{\rm{ - 0}}{\rm{.44}}\,\,{\rm{V}}\,\,{\rm{and}}\,\,{\rm{0}}{\rm{.80}}\,\,{\rm{V}}\), respectively.
On the basis of standard electrode potential, predict which of the following reaction can not occur ?

1 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}} \to {\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
2 \({\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}}\)
3 \({\rm{2CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + 2Ag(s)}} \to {\rm{2Cu(s) + A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}{\rm{(aq)}}\)
4 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
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CHXII03:ELECTROCHEMISTRY

330107 Beryllium is placed above magnesium in the II group. Beryllium dust, therefore, when added to \({\rm{MgC}}{{\rm{l}}_{\rm{2}}}\) solution will

1 Have no effect
2 Precipitate Mg metal
3 Precipitate MgO
4 Lead to dissolution of Be metal
CHXII03:ELECTROCHEMISTRY

330108 Assertion :
Zinc displaces copper from copper sulphate solution.
Reason :
\(\mathrm{E}^{\circ}\) of zinc is \(-0.76 \mathrm{~V}\) and that of copper is \(+0.34 \mathrm{~V}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330109 The standard reduction potentials of
\(\mathrm{Cu}^{+2}, \mathrm{Ag}^{+}, \mathrm{Hg}^{+2}\) and \(\mathrm{Mg}^{+2}\) are \(0.34 \mathrm{~V},+0.80 \mathrm{~V}\), \(+0.79 \mathrm{~V}\) and \(-2.37 \mathrm{~V}\) respectively. With increasing voltage, the sequence of deposition of metals on the cathode from a molten mixture containing all those ions is

1 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Cu}\)
2 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag}, \mathrm{Mg}\)
3 \(\mathrm{Ag}, \mathrm{Hg}, \mathrm{Cu}, \mathrm{Mg}\)
4 \(\mathrm{Cu}, \mathrm{Hg}, \mathrm{Mg}, \mathrm{Ag}\)
CHXII03:ELECTROCHEMISTRY

330110 Assertion :
Auric chloride \(\left(\mathrm{AuCl}_{3}\right)\) solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin.
Reason :
Gold is a very precious metal.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII03:ELECTROCHEMISTRY

330111 At 298 K, the standard electrode potentials of \({\rm{C}}{{\rm{u}}^{{\rm{2 + }}}}{\rm{/Cu,}}\,\,{\rm{Z}}{{\rm{n}}^{{\rm{2 + }}}}{\rm{/Zn,}}\,\,{\rm{F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{/Fe}}\,\,{\rm{and}}\,\,{\rm{A}}{{\rm{g}}^{\rm{ + }}}{\rm{/Ag}}\) \({\rm{are}}\,\,{\rm{0}}{\rm{.34V,}}\,\,{\rm{ - 0}}{\rm{.76}}\,\,{\rm{V,}}\,\,{\rm{ - 0}}{\rm{.44}}\,\,{\rm{V}}\,\,{\rm{and}}\,\,{\rm{0}}{\rm{.80}}\,\,{\rm{V}}\), respectively.
On the basis of standard electrode potential, predict which of the following reaction can not occur ?

1 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}} \to {\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
2 \({\rm{FeS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Fe(s)}}\)
3 \({\rm{2CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + 2Ag(s)}} \to {\rm{2Cu(s) + A}}{{\rm{g}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}{\rm{(aq)}}\)
4 \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Zn(s)}} \to {\rm{ZnS}}{{\rm{O}}_{\rm{4}}}{\rm{(aq) + Cu(s)}}\)
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