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Identifying each of the following chemical reaction as synthesis (S), decomposition (D), single replacement (SR), double replacement (DR) or combustion (C)
1) HgO --> Hg + O2 _________________
2) NaCl + AgNO3 --> NaNO3 + AgCl _____________
3) Mg + HCl --> MgCl2 + H2 ____________
4. Zn + H2SO4 --> ZnSO4 + H2 _________________
5. NaOH + HCl --> NaCl + H2O ____________
Answer: 1)D, 2)DR, 3)SR, 4)SR, 5)DR