Which reaction is a reversible reaction ? 

A) S + O2 → SO2 

B) PCl5 ⇌ PCl3+ Cl2 

C) 2 Na + Cl2 → 2 NaCl 

D) CaCO3 → CaO + CO2

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1 Answers

B) PCl5 ⇌ PCl3+ Cl2 

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