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Extraction of Moderately Reactive Metals

which of the ...

Question

which of the following oxides will produce dioxygen on treatment with wter ?
KClo3,Na2O2,CaO,SO3

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Solution

The reactions are as follows:

2KClO₃ +H₂O → K₂O + 2HClO₃
Na₂O₂(s) + H₂O(l) → NaOH(aq) + O₂(g)
CaO + H₂0 → Ca(OH)₂
SO₃ (g) + H2O (l) → H₂SO₄ (aq)
Hence, only Na₂O₂ produce dioxygen on treatment with water.

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