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Chemistry Past Questions

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3301

A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

  • A. boiling the water
  • B. adding excess calcium hydroxide
  • C. adding a calculated amount of calcium hydroxide
  • D. adding sodium carbonate
View Answer & Discuss (7) JAMB 2018
3302

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

  • A. Evaporation
  • B. Distillation
  • C. Filtration
  • D. Precipitation
View Answer & Discuss (9) JAMB 2018
3303

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
View Answer & Discuss JAMB 2018
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3304

Which of the following raw materials is used in the plastic industry?

  • A. Ethene
  • B. Methane
  • C. Sulphur
  • D. Hydrogen
View Answer & Discuss (1) WAEC 2018
3305

Which of the following organic compounds can undergo both addition and substitution reactions?

  • A. Pentane
  • B. Benzene
  • C. Propane
  • D. Hexane
View Answer & Discuss WAEC 2018
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now