Correct Answer: Option D

Explanation

The rusting of iron is a spontaneous reaction, meaning it occurs naturally without external energy input, as iron oxidizes to form rust (iron oxide) when exposed to oxygen and moisture. Although, it is a slow process, but  there is an increase in entropy (ΔS) as well as the emission of heat which makes it a spontaneous reaction as the resulting change in Gibbs free energy will be negative.i.e ΔG = - ve

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