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Classify the following reactions as combination. Also balance the equations.
Also balance the equations.
$(a)\mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})^{+} \mathrm{CO}_2(\mathrm{~g})$
$(b) \mathrm{Zn}(\mathrm{s})+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{ZnSO}_4(\mathrm{~S})+\mathrm{H}_2 (g)$
$(c) \mathrm{AgNO}_3 (aq) +\mathrm{NaCl} (aq) \rightarrow \mathrm{AgCl}(\mathrm{S})+\mathrm{NaNO}_3$
$(d) \mathrm{NH}_3 (g) +\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{NH}_4 \mathrm{Cl} (S)$
$(e) \mathrm{CuSO}_4 (aq) +\mathrm{H}_2 \mathrm{~S} (g) \rightarrow \mathrm{CuS}(\mathrm{S})+\mathrm{H}_2 \mathrm{SO}_4$ 
$(f) \mathrm{Zn}(\mathrm{S})+\mathrm{CuSO}_4 (aq) \rightarrow \mathrm{ZnSO}_4 \mathrm{~N} (aq) +\mathrm{Cu} (s)$
$(g) \mathrm{Ca}(\mathrm{s}) \mathrm{O}_2(\mathrm{~g}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})$
$(H)\mathrm{NaOH}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{H}_2 \mathrm{O}$
$(I) \mathrm{KOH}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{K}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}$