1.
• Cl - VII, O - II
• K - I, O- II
• Au - III, Cl - I
• Ni - III, O - II
• S - VI, O - II
• B - III, O - II
• Zn - II, O - II
2. Mn2O7, SnO2, BaCl2, Na2S, BaO, CrCl3
3.
SO2 - IV
BaS - II
P2S5 - II
Cu2S - II
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Answers & Comments
1.
• Cl - VII, O - II
• K - I, O- II
• Au - III, Cl - I
• Ni - III, O - II
• S - VI, O - II
• B - III, O - II
• Zn - II, O - II
2. Mn2O7, SnO2, BaCl2, Na2S, BaO, CrCl3
3.
SO2 - IV
BaS - II
P2S5 - II
Cu2S - II