Which of the following is a zero order reaction?
- A$2 \ HI \rightarrow H_2 + I_2$
- B$H_2 + Br_2 \xrightarrow{\Delta} 2 \ HBr$
- C$2 \ N_2O_5 \rightarrow 4 \ NO_2 + O_2$
- D$H_2 + Cl_2 \xrightarrow{hv} 2 \ HCl$
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