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Comment on the reactions of dihydrogen w...

Comment on the reactions of dihydrogen with (a) chlorine, (b) sodium and (c) copper (II) oxide.

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`H_(2)(g)+Cl_(2)(g)to2HCl(g)`
`2Na(s)+H_(2)(g)to2NaH(s)`
`CuO(s)+H_(2)(g)toCu(s)+H_(2)O`
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