Is $F e^{2 +}$ oxidised to $F e^{3 +}$ in aerated water ?
If yes enter 1, else enter 0.

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Solution

The relative stability of different oxidation states of transitions elements can be determined with the help of standard electrode potential.
For example, $F e^{2 +}$ is unstable in aerated water and is oxidized to $F e^{3 +}$ .
So, the correct answer is 1.

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