Question
Explain the mechanism of rusting of iron.
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Column $I ($Property$)$
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Column $II ($Element$)$
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| $(i)$ |
Lanthanoid which shows $+4$ oxidation state
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$(a)$ | $Pm$ |
| $(ii)$ |
Lanthanoid which can show $+2$ oxidation state
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$(b)$ | $Ce$ |
| $(iii)$ |
Radioactive lanthanoid
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$(c)$ | $Lu$ |
| $(iv)$ |
Lanthanoid which has $4f^7$ electronic configuration in $+3$ oxidation state
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$(d)$ | $Eu$ |
| $(v)$ |
Lanthanoid which has $4f^{14}$ electronic configuration in $+3$ oxidation state
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$(e)$ | $Gd$ |
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$(f)$ | $Dy$ |