a.CaCl2(aq)+ Na2CO3(aq) arrow CaCO3 (s) +2NaCl(aq)
b. Zn (s) +2HCl (aq) arrow ZnCl2(aq) H2(g)
c. NaOH (aq) + HCl (aq) arrow NaCl (aq0 + h2O (l)
d. CaCO3 (s) arrow CaO(s) arrow CaO(s0 + CaO(s) + CO2(g)
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