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Tuesday, 19 May 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 151:
JAMB 1979
On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?
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  • A SO<sub style='font-size: smaller;'>2</sub> (g) + FeS (s)
  • B SO<sub style='font-size: smaller;'>3</sub> (g) +FeS(s)
  • C SO<sub style='font-size: smaller;'>2</sub> (g) + SO<sub style='font-size: smaller;'>3</sub>(g)
  • D SO<sub style='font-size: smaller;'>2</sub> (g) + H<sub style='font-size: smaller;'>2</sub>S (g)
  • E SO<sub style='font-size: smaller;'>3</sub>(g) + H<sub style='font-size: smaller;'>2</sub>S(g)
View Answer & Explanation
Question 152:
JAMB 1979
One of the following techniques can be used to show that chlorophyll pigment is a mixture of chemical compounds and not a single coloured compound
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  • A Cystallization
  • B Hydrolysis
  • C Sublimation
  • D Filtration
  • E Chromatography
View Answer & Explanation
Question 153:
JAMB 1979
A gas occupies 30.0 dm<sup style='font-size: smaller;'>3</sup> at S.T.P. What volume would it occupy at 91<sup style='font-size: smaller;'>o</sup>C and 380 mm Hg?
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  • A 20. 0dm<sup style='font-size: smaller;'>3</sup>
  • B 40.0dm<sup style='font-size: smaller;'>3</sup>
  • C 60. 0dm<sup style='font-size: smaller;'>3</sup>
  • D 80. 0dm<sup style='font-size: smaller;'>3</sup>
  • E 100. 0dm<sup style='font-size: smaller;'>3</sup>
View Answer & Explanation
Question 154:
JAMB 1979
When excess ethanol is heated to 145 <sup style='font-size: smaller;'>o</sup>C in the presence of concentrated sulphuric acid, the product is
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  • A Diethyl ether
  • B Ethyne
  • C Diethyl sulphate
  • D Acetone
  • E Ethanoic acid
View Answer & Explanation
Question 155:
JAMB 1979
Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?
SchoolNGR Classroom
  • A CaCO <sub style='font-size: smaller;'>3</sub>
  • B Zn(NO<sub style='font-size: smaller;'>3</sub>)<sub style='font-size: smaller;'>2</sub>
  • C CuSO<sub style='font-size: smaller;'>4</sub>
  • D AICI<sub style='font-size: smaller;'>3</sub>
  • E CaSO<sub style='font-size: smaller;'>4</sub>
View Answer & Explanation

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