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Which one from the resulted reactions is used in submarine boats for the regeneration of air?

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Which one from the resulted reactions is used in submarine boats for the regeneration of air?

А.   2Na2O2 + 2CO2 = 2Na2CO3 + O2

B.   2KClO3 = 2KCl + 3O2

C.   2NaNO3 = 2NaNO2 + O2

D.   2H2O2 = 2H2O + O2

E.   2KMnO4 = K2MnO4 + MnO2 + O2 

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А.   2Na2O2 + 2CO2 = 2Na2CO3 + O2

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