MCQ
When ammonia is passed over heated $CuO$, it is oxidised to
- ✓${N_2}$
- B$N{O_2}$
- C${N_2}O$
- D$HN{O_2}$
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$CoCl_3 \cdot 6NH_3, CoCl_3 \cdot 5NH_3,CoCl_3\cdot 4NH_3$ respectively is