Jamb Chemistry Past Questions For Year 2018
Question 81
The situation obtained when a perfect gas expands into a vacuum is
- A. ΔH is positive and TΔ S is zero
- B. ΔH is positive and T Δ S is negative
- C. ΔH is negative and TΔ S is zero
- D. ΔH is zero and T Δ S is positive
Question 82
Which of the following separation techniques can be employed in obtaining solvent from its solution?
- A. Evaporation
- B. Distillation
- C. Filtration
- D. Precipitation
Question 83
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
Question 84
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
- A. disintegration
- B. polymerization
- C. cracking
- D. degradation
Question 85
Which of the compounds is composed of Al, Si, O and H?
- A. Epson salt
- B. Limestone
- C. Clay
- D. Urea
