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Three of the following lower the critical supersaturation of an aerosol particle. Which is the odd one out?

  • A.increasing the radius of the dry particle itself
  • B.using a salt that is considerably more soluble
  • C.coating the particle with an insoluble film
  • D.increasing the mass of soluble material present

Answer: C

An insoluble coating reduces the solute available and hinders wetting, raising rather than lowering the requirement. The other three each strengthen the solute effect that opposes curvature. Solubility and size are the two properties that matter most in practice.

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