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\( \mathrm{Mg}_{3} \mathrm{~N}_{2} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow} \mathrm{A}( \) gas \( ) \stackrel{\mathrm{CuO}}{\longrightarrow} \mathrm{B}+\mathrm{C}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O} \)
P
W
\( \mathrm{C}(\mathrm{g}) \) can be obtained by heating
(1) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \)
(2) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
(3) \( \mathrm{NH}_{4} \mathrm{NO}_{3} \)
(4) \( \mathrm{NH}_{4} \mathrm{Cl} \)
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