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What conclusion can be drawn from the fo...

What conclusion can be drawn from the following reactions about the nature of oxides?
`(1) 4Na(s) + O_2(g)rarr 2Na_(2)O(s); Na_(2)O(s) + H_(2)O(l) rarr 2NaOH(aq)`
`(2) S(s) + O_2(g)rarr SO_(2)(g); SO_(2)(g) + H_(2)O(l) rarr H_(2)SO_(4)(aq)`

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