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2.NO, N+O=0, N=2
6.2N+2O=0 ; 2N+2(-2)=0 ; 2N=4;N=2
3. 2N+O=0 : 2N-2=0 ;N=1
4.N+2O=0-->N+2(-2)=0-->N=4
5. 2N+5O=0-->2N-10=0-->2N=10-->N=5
7. Ca+2N+30=0, 2+2N+(-6)=0, 2N=4, N=2
8.NH⁺⁴--> N+H=4, N+1=4, N=3
9. NO²⁻--> N+O=-2, N+(-2)=-2, N=0
10NO³⁻--> N+O=-3, N+(-2)=-3, N=-1