At $300 \ K$,when a solute is added to a solvent,its vapour pressure over the mercury reduces from $50 \ mm$ to $45 \ mm$. The value of the mole fraction of the solute will be:

  • A
    $0.005$
  • B
    $0.01$
  • C
    $0.1$
  • D
    $0.9$

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