Corrosion
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CHXII03:ELECTROCHEMISTRY

329955 Assertion :
Galvanised iron does not rust.
Reason :
Zinc has more negative electrode potential than iron.

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 Both Assertion and Reason are incorrect
AIIMS - 2005
CHXII03:ELECTROCHEMISTRY

329941 Identify the correct statement:

1 Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.
2 Iron corrodes in oxygen free water
3 Corrosion of iron can be minimized by forming an impermeable barrier at its surface.
4 Iron corrodes more rapidly in salt water because its electrochemical potential is higher
CHXII03:ELECTROCHEMISTRY

329942 Which of the following reactions does not take place during rusting ?

1 \({H_2}C{O_3} \rightleftharpoons 2{H^ + } + CO_3^{2 - }\)
2 \({\rm{4F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{ + 3}}{{\rm{O}}_{\rm{2}}}{\rm{(dry)}} \to {\rm{2F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
3 \(4F{e^{2 + }} + {O_2} + 4{H_2}O \to 2F{e_2}{O_3} + 8{H^ + }\)
4 \(F{e_2}{O_3} + x{H_2}O \to F{e_2}{O_3} \cdot x{H_2}O\)
CHXII03:ELECTROCHEMISTRY

329943 The composition of rust is

1 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.}}\,\,{\rm{x}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\,\,{\rm{.}}\,\,{\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
3 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.6}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
4 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
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CHXII03:ELECTROCHEMISTRY

329955 Assertion :
Galvanised iron does not rust.
Reason :
Zinc has more negative electrode potential than iron.

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 Both Assertion and Reason are incorrect
AIIMS - 2005
CHXII03:ELECTROCHEMISTRY

329941 Identify the correct statement:

1 Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.
2 Iron corrodes in oxygen free water
3 Corrosion of iron can be minimized by forming an impermeable barrier at its surface.
4 Iron corrodes more rapidly in salt water because its electrochemical potential is higher
CHXII03:ELECTROCHEMISTRY

329942 Which of the following reactions does not take place during rusting ?

1 \({H_2}C{O_3} \rightleftharpoons 2{H^ + } + CO_3^{2 - }\)
2 \({\rm{4F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{ + 3}}{{\rm{O}}_{\rm{2}}}{\rm{(dry)}} \to {\rm{2F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
3 \(4F{e^{2 + }} + {O_2} + 4{H_2}O \to 2F{e_2}{O_3} + 8{H^ + }\)
4 \(F{e_2}{O_3} + x{H_2}O \to F{e_2}{O_3} \cdot x{H_2}O\)
CHXII03:ELECTROCHEMISTRY

329943 The composition of rust is

1 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.}}\,\,{\rm{x}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\,\,{\rm{.}}\,\,{\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
3 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.6}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
4 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
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CHXII03:ELECTROCHEMISTRY

329955 Assertion :
Galvanised iron does not rust.
Reason :
Zinc has more negative electrode potential than iron.

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 Both Assertion and Reason are incorrect
AIIMS - 2005
CHXII03:ELECTROCHEMISTRY

329941 Identify the correct statement:

1 Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.
2 Iron corrodes in oxygen free water
3 Corrosion of iron can be minimized by forming an impermeable barrier at its surface.
4 Iron corrodes more rapidly in salt water because its electrochemical potential is higher
CHXII03:ELECTROCHEMISTRY

329942 Which of the following reactions does not take place during rusting ?

1 \({H_2}C{O_3} \rightleftharpoons 2{H^ + } + CO_3^{2 - }\)
2 \({\rm{4F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{ + 3}}{{\rm{O}}_{\rm{2}}}{\rm{(dry)}} \to {\rm{2F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
3 \(4F{e^{2 + }} + {O_2} + 4{H_2}O \to 2F{e_2}{O_3} + 8{H^ + }\)
4 \(F{e_2}{O_3} + x{H_2}O \to F{e_2}{O_3} \cdot x{H_2}O\)
CHXII03:ELECTROCHEMISTRY

329943 The composition of rust is

1 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.}}\,\,{\rm{x}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\,\,{\rm{.}}\,\,{\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
3 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.6}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
4 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
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CHXII03:ELECTROCHEMISTRY

329955 Assertion :
Galvanised iron does not rust.
Reason :
Zinc has more negative electrode potential than iron.

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 Both Assertion and Reason are incorrect
AIIMS - 2005
CHXII03:ELECTROCHEMISTRY

329941 Identify the correct statement:

1 Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.
2 Iron corrodes in oxygen free water
3 Corrosion of iron can be minimized by forming an impermeable barrier at its surface.
4 Iron corrodes more rapidly in salt water because its electrochemical potential is higher
CHXII03:ELECTROCHEMISTRY

329942 Which of the following reactions does not take place during rusting ?

1 \({H_2}C{O_3} \rightleftharpoons 2{H^ + } + CO_3^{2 - }\)
2 \({\rm{4F}}{{\rm{e}}^{{\rm{2 + }}}}{\rm{ + 3}}{{\rm{O}}_{\rm{2}}}{\rm{(dry)}} \to {\rm{2F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
3 \(4F{e^{2 + }} + {O_2} + 4{H_2}O \to 2F{e_2}{O_3} + 8{H^ + }\)
4 \(F{e_2}{O_3} + x{H_2}O \to F{e_2}{O_3} \cdot x{H_2}O\)
CHXII03:ELECTROCHEMISTRY

329943 The composition of rust is

1 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.}}\,\,{\rm{x}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
2 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\,\,{\rm{.}}\,\,{\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
3 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}{\rm{.6}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\)
4 \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
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