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This is a double displacement reaction. A. H2SO4 + Zn → ZnSO4 + H2 B. CaCO3...

This is a double displacement reaction.

A. H2SO4 + Zn → ZnSO4 + H2

B. CaCO3 → CaO + CO2

C. C + O2 → CO2

D. CH4 + 2O2 → CO2 + 2H2O

E. AgNO3 + NaCl → NaNO3 + AgCl

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