Q.
A. 2Ag + 2 HCl + (O) → 2AgCl + H2O
B. 2Zn + O2 → 2ZnO
C. 2ZnS + 3O2 → 2ZnO + 2SO2
D. MgCO3 → MgO + CO2
E. None of the above
Correct choice: D
Explanation: