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Comment on the reactions of dihydrogen w...

Comment on the reactions of dihydrogen with (i) chlorine, (ii) sodium, and (iii) copper(II) oxide

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`H_2(g) + Cl_2(g) to 2HCl(g) `
`2Na(s) + H_2 (g) to 2NaH(s)`
`CuO(s) + H_2(g) to Cu(s) + H_2O`
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