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a fost răspuns

Completeaza ecuatiile reactiilor: a) H2S+NaOH-->? +?
b) Na2S+ZnCl2-->?ZnS+?
c) AgNO3+H2-->Ag2S+?
d)H2S+Pb(NO3)2-->PbS+?
e)H2S+CuSO4-->CuS+?
f)Na2S+FeSO4--->FeS+?