Which of the following is a second order reaction

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$2 N_{2} O_{5} ⟶ 2 {NO}_{2} + O_{2}$

${KClO}_{3} + {FeSO}_{4} + 3 H_{2} {SO}_{4} ⟶ KCl + 3 {Fe}_{2} {({SO}_{4})}_{3} + 3 H_{2} O$

$2 {NH}_{3} \underset{High P}{\overset{Pt}{⟶}} N_{2} + 3 H_{2}$

$C_{2} H_{4 (g)} + H_{2 (g)} ⟶ C_{2} H_{6 (g)}$

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Detailed Solution

${KClO}_{3} + {FeSO}_{4} + 3 H_{2} {SO}_{4} ⟶ KCl + 3 {Fe}_{2} {({SO}_{4})}_{3} + 3 H_{2} O$ is second order reaction

$C_{2} H_{4 (g)} + H_{2 (g)} ⟶ C_{2} H_{6 (g)}$ is first order reaction

$2 N_{2} O_{5} ⟶ 2 {NO}_{2} + O_{2}$ is first order reaction

$2 {NH}_{3} \underset{High P}{\overset{Pt}{⟶}} N_{2} + 3 H_{2}$ is zero order reaction

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