Complete and balance the following chemical equations:
(i) `NaOH(aq)+Zn(s) to`
(ii) `CaCO_(3)(s)+H_(2)O(l)+CO_(2)(g) to`
(iii) `HCl(aq)+H_(2)O(l) to`

Explanation

(i) `2NaOH(aq)+Zn(s) to Na_(2)ZnO_(2)(aq)+H_(2)(g)`
(ii) `CaCO_(3)(s)+H_(2)O(l)+CO_(2)(g) toCa(HCO_(3))_(2)(aq)`
(iii) `HCl(aq)+H_(2)O(l) to H_(3)O^(+)(aq)+Cl^(-)(aq)`