A) \[M{{g}_{3}}{{N}_{2}}\]
B) \[Mg{{(N{{O}_{3}})}_{2}}\]
C) \[MgC{{O}_{3}}\]
D) \[Mg{{(N{{O}_{3}})}_{3}}\]
Correct Answer: A
Solution :
\[Mg\] froms \[MgO\] on heating in air but it reacts with \[{{N}_{2}}\] to form \[M{{g}_{3}}{{N}_{2}}\], \[{{N}_{2}}\] is available in atmosphere in excess.
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