15. 16. 17¹. 18. O:(g) Cr(s)+ Cu(s) H₂SO₂(aq) Ch(g) NCH(g) HNO,(aq) NO:(g) CrCh(s) Cr(OH),(s) Cu(NO)2(aq) + Cr.(SO₂),(s) Cl₂O(g) NO:(g) H₂O(l) H₂O(1)

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