ПОМОГИТЕ С ХИМИЕЙ,ПЖЛ,СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Хим реакция возможна между веществами формулы которых:

1)CO2 и Cl2O7

2)P2O5 и K2O

3)NO2 и SiO2

4)CuO и H2O
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