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Pollution of Air and Water — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8SciencePollution of Air and Water1 Mark
MCQ
The percentage of nitrogen is
  • A
    $21\%$
  • ✓
    $78\%$
  • C
    $12\%$
  • D
    $87\%$
✓

Answer

Correct option: B.
$78\%$

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