определите реакцию замещения
А)2Н2+О2=2Н2О
В)2Н2О=2Н2+О2
С)СaО+2НСl2=CaCl2+H2O
D)Fe+H2SO4=FeSo4+H2
E)NaOH=HNO3=NaNo3+H2O
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