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Air — Social Studies STD 7 — Question

CBSE BoardEnglish MediumSTD 7Social StudiesAir1 Mark
MCQ
Which is the second most plentiful gas in the air:
  • A
    Nitrogen.
  • B
    Argon.
  • ✓
    Oxygen.
  • D
    Hydrogen.
✓

Answer

Correct option: C.
Oxygen.

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