In the following reaction,$3CuO + 2NH_3 \to N_2 + 3H_2O + 3Cu$,what happens during the conversion of $NH_3$ to $N_2$?
- APer mole of $N_2$,$6$ electrons are lost.
- BPer mole of $N_2$,$3$ electrons are lost.
- CPer mole of $N_2$,$7$ electrons are gained.
- DPer mole of $N_2$,$3$ electrons are gained.
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