Analyze the provided image and extract all chemical formulas and any accompanying text. Classify the formulas by type if possible (e.g., oxides, acids, bases, salts).

Extracted Data:

• Text: Х.д. (ІІ вариант)
• Chemical Formulas:
  • SO₃
  • P₂O₃
  • P₂O₅
  • P₂O₅
  • PbO₂
  • N₂O₅
  • N₂O₂
  • O₂
  • NO
  • N₂O

Classification:

• Oxides: SO₃, P₂O₃, P₂O₅, PbO₂, N₂O₅, N₂O₂, O₂, NO, N₂O

Note: The image contains chemical formulas, some of which are repeated. All identified formulas are classified as oxides. The text 'Х.д. (ІІ вариант)' appears to be a label or a variant indicator.