Question

Ca -> CaO -> CaCl -> Ca(OH)2 -> CaCo3

Answer 1

1)2Ca+O2=2CaO

2)CaO+2HCl=CaCl2+H2O

3)CaCl2+2NaOH=2NaCl+Ca(OH)2↓

4)Ca(OH)2+K2CO3=2KOH+CaCO3

Answer 2

2Ca +O2=2CaO

CaO+HCl=CaO=H2O