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86

Which of the following separation techniques can be employed in obtaining solvent from its solution?

  • A. Evaporation
  • B. Distillation
  • C. Filtration
  • D. Precipitation
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87

In the upper atmosphere, the ultra-violet light breaks off a free chlorine atom from chlorofluorocarbon molecule. The effect of this is that the free chlorine atom will

  • A. be very reactive and will attack ozone
  • B. be non-reactive and will not attack ozone
  • C. not change the level of ozone in the atmosphere
  • D. increase the level of ozone in the atmosphere
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