a. \(Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2 \uparrow\)
b. \(Zn + AgNO_3 \rightarrow Zn(NO_3)_2 + 2Ag \downarrow\)
c. \(2Na + S \rightarrow Na_2S\)
d. \(Ca + Cl_2 \rightarrow CaCl_2\)
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