Answer:
Mg bums in air to form MgO and \[M{{g}_{3}}{{N}_{2}}\].
\[2Mg+{{O}_{2}}\xrightarrow{\Delta }\,2\,MgO\,\,\,;\]\[3\ Mg+{{N}_{2}}\xrightarrow{\Delta }\,M{{g}_{3}}{{N}_{2}}\]
Magnesium nitride on hydrolysis with \[{{H}_{2}}O\]gives \[N{{H}_{3}}\].
\[M{{g}_{3}}{{N}_{2}}+6\,{{H}_{2}}O\xrightarrow{\,}\,3\,Mg{{(OH)}_{2}}+\,2\,N{{H}_{3}}\]
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