в какой из приведенных реакций степень окисления не изменяется?
a) Kl+Cl2=2KCl+l2
б) 2HgO=2Hg+O2
в)FeCl3+3NaOH=Fe(OH)3+3NaCl
г)Zn+2HCl=ZnCl2+H2
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