1) Au + S = AuS
2) 2Cu + O2 = 2СuО
3) 2Ag + S = Ag2S
4) 2Hg + O2 = 2HgO
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Answers & Comments
1) Au + S = AuS
2) 2Cu + O2 = 2СuО
3) 2Ag + S = Ag2S
4) 2Hg + O2 = 2HgO