Which of the following reactions is the metal displacement reaction? Choose the right option.

1. \(2 \mathrm{KClO}_3 \xrightarrow{\Delta} 2 \mathrm{KCl}+3 \mathrm{O}_2\)
2. \(\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \xrightarrow{\Delta} \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}\)
3. \(\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_2+\mathrm{H}_2 \uparrow\)
4. \(2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2 \rightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_2+\mathrm{O}_2 \uparrow\)

Solution

Asked in: NEET 2021

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