Ответы на вопрос:
al2o3=> o3(-2) al2(+3)
h3po4=> h3(+1) p(+5) o4(-2)
kmno4=> k(+1) mn(+7) o4(-2)
k2mno4=> k2(+1) mn(+6) o4(-2)
nh3=> n(-3) h(+1)
mgo=> mg(+2) o(-2)
fecl3=> fe(+3) cl3(-1)
kclo3=> k(+1) cl(+5) o3(-2)
!
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