Cоставить уравнения реакций .
обмена:
FeSO4+BaCl2
CuO+H2SO4
H2SO4+BaCl2
NaOH+HNO3
Cu(OH)2+H2SO4
Na2S+AgNO3 ПОМОГИТЕ СРОЧНО , 50 БАЛЛОВ ДАЮ.
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