Write the balanced chemical equations with state symbols for the following reactions :
(i) Iron filings react with steam to produce iron (III) oxide and hydrogen gas.
(ii) Magnesium reacts with nitrogen upon heating to form magnesium nitride.
(iii) Ethane burns in oxygen to form carbon dioxide and water.
(iv) Sodium hydroxide solution (in water) reacts with hydrochloric acid (in water) to form sodium chloride (in water) and water.

Explanation

`(i)" "2Fe(s) + 3H_(2)O(g) to Fe_(2)O_(3)(s) + 3H_(2)(g)`
`(ii)" "3Mg(s) + N_(2)(g) overset("heat "(triangle))to Mg_(3)N_(2)(s)`
`(iii)" "2C_(2)H_(6)(g) + 7O_(2)(g) to 4CO_(2)(g) + 6H_(2)O(l)`
`(iv)" "NaOH(aq) + HCl(aq) to NaCl(aq) + H_(2)O(l)`.