निम्नलिखित रासायनिक समीकरणों को संतुलित कीजिये :
(a) `N_(2)(g) +H_(2) overset (" गर्म ") to NH_(3)(g)`
(b) `Pb (NO_(3))_(2)(s) overset (" गर्म ")to PbO(s) +NO_(2)(g) +O_(2)(g)`
(c ) `Na(s)+H_(2)O(l) overset ("heat ") to NaOH (aq) +H_(2)(g)`

Explanation

`N_(2)(g) +3H_(2) (g) overset (. गर्म ") to 2NH_(3)`
(b) `2Pb(NO_(3))_(2)(s) overset ("गर्म ") to 2PbO(s) +4NO_(2)+O_(2)(g)`
(c ) `2Na (s) + 2H_(2) O(l) to 2NaOH (aq) +H_(2)`