помогите пожалуйста, 20 баллов
HCl + MnO2 → MnCl2 + H₂O + Cl₂
Cu + HNO3 → Cu(NO3)2 + NO2 + H₂O Fe(OH)2 + H₂O + O₂ Fe(OH)3
Cu₂O + NH3 + H₂O [Cu(NH3)2]OH ​
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