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An antioxidant is added to a lubricating oil to

  • A.reduce the oil's tendency to foam
  • B.interrupt the chain reaction of oxidation
  • C.neutralise the acids already formed
  • D.improve the oil's boundary lubrication

Answer: B

Hindered phenols and zinc dithiophosphates intercept the radicals and peroxides that would otherwise propagate the oxidation, so sludge and acid formation are delayed. Once the additive is exhausted the oil degrades rapidly.

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