Balance the following equation by Hit and trial method :

${\mathrm{Mg}}_3{\mathrm{N}}_2 + {\mathrm{H}}_2\mathrm{O} \to \mathrm{Mg}{\left(\mathrm{OH}\right)}_2 + {\mathrm{NH}}_3$

Balance the following equation by Hit and trial method :

${\mathrm{NH}}_3 + {\mathrm{O}}_2 \to \mathrm{NO} + {\mathrm{H}}_2\mathrm{O}$

Balance the following equation by Hit and trial method :

${\mathrm{NH}}_{3 }+ {\mathrm{Cl}}_{2 }\to {\mathrm{NH}}_4\mathrm{Cl} + {\mathrm{N}}_2$

Balance the following equation by Hit and trial method :

${\mathrm{NH}}_3 + {\mathrm{Cl}}_2 \left(\mathrm{excess}\right) \to {\mathrm{NCl}}_3 + \mathrm{HCl}$

Balance the following equation by Hit and trial method :

${\mathrm{CaOCl}}_2 + {\mathrm{NH}}_3 \to {\mathrm{CaCl}}_2 + {\mathrm{H}}_2\mathrm{O} + {\mathrm{N}}_2$

Balance the following equation by Hit and trial method :

$\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2 \to \mathrm{PbO}+{\mathrm{NO}}_2+{\mathrm{O}}_2$

Balance the following equation by Hit and trial method :

${\mathrm{Hg}}_2{\left({\mathrm{NO}}_3\right)}_2 \to \mathrm{Hg} + {\mathrm{NO}}_2 + {\mathrm{O}}_2$

Balance the following equation by Hit and trial method :

$\mathrm{Na} + {\mathrm{NH}}_3 \to {\mathrm{NaNH}}_2 + {\mathrm{H}}_2$

Balance the following equation by Hit and trial method :

${\mathrm{HNO}}_3 + {\mathrm{H}}_2\mathrm{S} \to {\mathrm{NO}}_2 + {\mathrm{H}}_2\mathrm{O} + \mathrm{S}$