Помогите расставить коэффициенты.

NaOH + H2SO4 -> Na2SO4 + H2O

CaO+P2O5 -> Ca3(PO4)2

H2SO4+Al -> H2 + Al2(SO4)3

Zn+FeCl3 -> ZnCl2+Fe

Укажите типы реакций. (Соединение,Замещение,Разложение,Обмен)

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