MCQ
Which of the following is a unimolecular reaction?
- A$2 HI \rightarrow H _2+ I _2$
- ✓$N _2 O _5 \rightarrow N _2 O _4+1 / 2 O _2$
- C$H _2+ Cl _2 \rightarrow 2 HCl$
- D$PCl _3+ Cl _2 \rightarrow PCl _5$
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