Виберіть реакцію розкладу:

CaO + H_{2}*O =Ca(OH) 2

2Na + 2H_{2}*O = 2NaOH + H_{2}

2H_{2}*O_{2} = 2H_{2}*O + O_{2}

2H_{2} + O_{2} = 2H_{2}*O
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