The petrol having octane number $80$ has

  • A
    $20\% \, n$-heptane + $80\%$ iso-octane
  • B
    $80\% \, n$-heptane + $20\%$ iso-octane
  • C
    $20\% \, n$-heptane + $80\%$ normal octane
  • D
    $80\% \, n$-heptane + $20\%$ normal octane

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