Which of the following is not an intermolecular redox reaction?

1. $\mathrm{MgCO}_{3} \longrightarrow \mathrm{MgO}+\mathrm{CO}_{2}$
2. $\mathrm{O}_{2}+2 \mathrm{H}_{2} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}$
3. $\mathrm{K}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{KOH}+(1 / 2) \mathrm{H}_{2}$
4. $\mathrm{MnBr}_{3} \longrightarrow \mathrm{MnBr}_{2}+(1 / 2) \mathrm{Br}_{2}$

Solution

Asked in: JEE-TOPICTESTS-CHEMISTRY

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