a) 2AgNO3+Na2S--->Ag2S↓+2NaNO3
2Ag+ +2NO3- +2Na+ +S2- --->Ag2S↓ +2Na+ +2NO3-
2Ag+ +S2- --->Ag2S↓
b) Pb(NO3)2+K2SO4--->PbSO4↓+2KNO3
Pb2+ +2NO3- +2K+ +SO4 2- --->PbSO4↓ +2K+ +2NO3-
Pb2+ +SO4 2- --->PbSO4↓
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a) 2AgNO3+Na2S--->Ag2S↓+2NaNO3
2Ag+ +2NO3- +2Na+ +S2- --->Ag2S↓ +2Na+ +2NO3-
2Ag+ +S2- --->Ag2S↓
b) Pb(NO3)2+K2SO4--->PbSO4↓+2KNO3
Pb2+ +2NO3- +2K+ +SO4 2- --->PbSO4↓ +2K+ +2NO3-
Pb2+ +SO4 2- --->PbSO4↓