Corrosion
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CHXII03:ELECTROCHEMISTRY

329951 Identify the correct statement:

1 Corrosion of iron can be minimised by forming an impermeable barrier at its surface.
2 Iron corrodes in oxygen-free water.
3 Iron corrodes more rapidly in salt water because its electrochemical potential is higher.
4 Corrosion of iron can be minimised by forming a contact with another metal with a higher reduction potential.
JEE - 2016
CHXII03:ELECTROCHEMISTRY

329952 The rusting of iron takes place as follows:
\(2 \mathrm{H}^{+}+2 \mathrm{e}^{-}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{H}_{2} \mathrm{O}(1) ; \mathrm{E}^{\circ}=+1.23 \mathrm{~V}\)
\(\mathrm{Fe}^{2+}+2 \mathrm{e} \rightarrow \mathrm{Fe}(\mathrm{s}) ; \mathrm{E}^{\circ}=-0.44 \mathrm{~V}\)
Calculate \(\Delta \mathrm{G}^{\circ}\) for the net process

1 \(-322 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(-161 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(-152 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(-76 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHXII03:ELECTROCHEMISTRY

329953 Assertion :
Corrosion of iron is commonly known as rusting.
Reason :
Corrosion of iron occurs in presence of water and air.

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

329954 Assertion :
Corrosion causes enormous damage to buildings, bridges, ships and to all objects made of metals.
Reason :
Corrosion changes the chemical composition of metals.

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.
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CHXII03:ELECTROCHEMISTRY

329951 Identify the correct statement:

1 Corrosion of iron can be minimised by forming an impermeable barrier at its surface.
2 Iron corrodes in oxygen-free water.
3 Iron corrodes more rapidly in salt water because its electrochemical potential is higher.
4 Corrosion of iron can be minimised by forming a contact with another metal with a higher reduction potential.
JEE - 2016
CHXII03:ELECTROCHEMISTRY

329952 The rusting of iron takes place as follows:
\(2 \mathrm{H}^{+}+2 \mathrm{e}^{-}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{H}_{2} \mathrm{O}(1) ; \mathrm{E}^{\circ}=+1.23 \mathrm{~V}\)
\(\mathrm{Fe}^{2+}+2 \mathrm{e} \rightarrow \mathrm{Fe}(\mathrm{s}) ; \mathrm{E}^{\circ}=-0.44 \mathrm{~V}\)
Calculate \(\Delta \mathrm{G}^{\circ}\) for the net process

1 \(-322 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(-161 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(-152 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(-76 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHXII03:ELECTROCHEMISTRY

329953 Assertion :
Corrosion of iron is commonly known as rusting.
Reason :
Corrosion of iron occurs in presence of water and air.

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

329954 Assertion :
Corrosion causes enormous damage to buildings, bridges, ships and to all objects made of metals.
Reason :
Corrosion changes the chemical composition of metals.

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.
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CHXII03:ELECTROCHEMISTRY

329951 Identify the correct statement:

1 Corrosion of iron can be minimised by forming an impermeable barrier at its surface.
2 Iron corrodes in oxygen-free water.
3 Iron corrodes more rapidly in salt water because its electrochemical potential is higher.
4 Corrosion of iron can be minimised by forming a contact with another metal with a higher reduction potential.
JEE - 2016
CHXII03:ELECTROCHEMISTRY

329952 The rusting of iron takes place as follows:
\(2 \mathrm{H}^{+}+2 \mathrm{e}^{-}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{H}_{2} \mathrm{O}(1) ; \mathrm{E}^{\circ}=+1.23 \mathrm{~V}\)
\(\mathrm{Fe}^{2+}+2 \mathrm{e} \rightarrow \mathrm{Fe}(\mathrm{s}) ; \mathrm{E}^{\circ}=-0.44 \mathrm{~V}\)
Calculate \(\Delta \mathrm{G}^{\circ}\) for the net process

1 \(-322 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(-161 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(-152 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(-76 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHXII03:ELECTROCHEMISTRY

329953 Assertion :
Corrosion of iron is commonly known as rusting.
Reason :
Corrosion of iron occurs in presence of water and air.

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

329954 Assertion :
Corrosion causes enormous damage to buildings, bridges, ships and to all objects made of metals.
Reason :
Corrosion changes the chemical composition of metals.

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.
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CHXII03:ELECTROCHEMISTRY

329951 Identify the correct statement:

1 Corrosion of iron can be minimised by forming an impermeable barrier at its surface.
2 Iron corrodes in oxygen-free water.
3 Iron corrodes more rapidly in salt water because its electrochemical potential is higher.
4 Corrosion of iron can be minimised by forming a contact with another metal with a higher reduction potential.
JEE - 2016
CHXII03:ELECTROCHEMISTRY

329952 The rusting of iron takes place as follows:
\(2 \mathrm{H}^{+}+2 \mathrm{e}^{-}+\dfrac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{H}_{2} \mathrm{O}(1) ; \mathrm{E}^{\circ}=+1.23 \mathrm{~V}\)
\(\mathrm{Fe}^{2+}+2 \mathrm{e} \rightarrow \mathrm{Fe}(\mathrm{s}) ; \mathrm{E}^{\circ}=-0.44 \mathrm{~V}\)
Calculate \(\Delta \mathrm{G}^{\circ}\) for the net process

1 \(-322 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
2 \(-161 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3 \(-152 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4 \(-76 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
CHXII03:ELECTROCHEMISTRY

329953 Assertion :
Corrosion of iron is commonly known as rusting.
Reason :
Corrosion of iron occurs in presence of water and air.

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

329954 Assertion :
Corrosion causes enormous damage to buildings, bridges, ships and to all objects made of metals.
Reason :
Corrosion changes the chemical composition of metals.

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.
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