December 2021 1 20 Report
А5. Какое уравнение
соответствует реакции обмена?


1) BaCl2
+ Na2CO3
→ BaCO3
+ 2NaCl
2) 2Al + 3H2SO4
→ Al2(SO4)3
+ 3H2
3) H2O
+ K2O
→ 2KOH
4) Fe(OH)2
→ FeO + H2O
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