Please tell me how to assign oxid.no. for tge elements of compound 2AgNO3? I know O has oxidn. No. -2 but what about the rest? Same for 3CuSO4. Help!

Dear Student

AgNO₃: 
NO₃^- has total charge -1. 

3 O have = 3 x (-2) = -6 
1 N has = -6 - (-1) = -5

Now, since NO₃^- has total charge -1, So, Ag has charge +1.

CuSO₄:
SO₄^2- has total charge -2.
4 O have = 4 x (-2) = -8
1 S has = -8 - (-2) = -6

Now, since SO₄^2- has total charge -2, So, Cu has charge +2.


Regards