Elements Forming Multiple Oxides

Steps:

• Recall common oxides: Carbon forms CO (carbon monoxide) and CO₂ (carbon dioxide).
• Nitrogen forms multiple oxides like N₂O (nitrous oxide), NO (nitric oxide), and NO₂ (nitrogen dioxide).
• Sulfur forms SO₂ (sulfur dioxide) and SO₃ (sulfur trioxide).
• Confirm all three elements have more than one oxide, matching option A.

Why A is correct:

• Carbon, nitrogen, and sulfur each exhibit variable oxidation states (e.g., C in +2 and +4; N in +1, +2, +4, +5; S in +4 and +6), allowing formation of multiple oxides.

Why the others are wrong:

• B omits sulfur, which forms SO₂ and SO₃.
• C omits nitrogen, which forms N₂O, NO, NO₂, and more.
• D omits carbon, which forms CO and CO₂.

Final answer: A