a. \(Mg + 2HCl \rightarrow MgCl_2 + H_2 \uparrow\)
b. \(Cu + 2AgNO_3 \rightarrow Cu(NO_3)_2 + 2Ag \downarrow\)
c. \(2Zn + O_2 \rightarrow 2ZnO\)
d. \(Cu + Cl_2 \rightarrow CuCl_2\)
e. \(2K + S \rightarrow K_2S\)
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