Select the correct statement based on following half-cell reactions.  
 
  • a)
    Fe2+ solutions are not stable in air
  • b)
    Fe nails can prevent oxidation of Fe2+ to Fe3+  by air
  • c)
    Corrosion of iron takes place by air
  • d)
    All of the above
Correct answer is option 'D'. Can you explain this answer?

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Defence Exams
Jan 19, 2021


cell > 0, thus spontaneous
Thus, Fe3+ is reduced to Fe2+ by iron nails.
Then (b) is correct.

cell > 0, thus spontaneous.
Hence, corrosion of iron takes place in air.

Ecell 0, thus spontaneousThus, Fe3+ is reduced to Fe2+ by iron nails.Then (b) is correct.Ecell 0, thus spontaneous.Hence, corrosion of iron takes place in air.
Ecell 0, thus spontaneousThus, Fe3+ is reduced to Fe2+ by iron nails.Then (b) is correct.Ecell 0, thus spontaneous.Hence, corrosion of iron takes place in air.