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Chemistry 1979 JAMB Past Questions

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41
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
  • A. cystallization
  • B. hydrolysis
  • C. sublimation
  • D. filtration
  • E. chromatography
View Answer & Discuss (1) JAMB 1979
42

A gas occupies a volume of 30.0 dm\(^3\) at S.T.P. What volume would it occupy at 91\(^0\)C and 380 mm Hg?

  • A. 20. 0dm3
  • B. 40.0dm3
  • C. 60. 0dm3
  • D. 80. 0dm3
  • E. 100. 0dm3
View Answer & Discuss (16) JAMB 1979
43
When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is
  • A. diethyl ether
  • B. ethyne
  • C. diethyl sulphate
  • D. acetone
  • E. ethanoic acid
View Answer & Discuss (16) JAMB 1979
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44
Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?
  • A. CaCO 3
  • B. Zn(NO3)2
  • C. CuSO4
  • D. AICI3
  • E. CaSO4
View Answer & Discuss (2) JAMB 1979
45
A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is
  • A. Zn
  • B. Cu
  • C. Al
  • D. Au
  • E. Ca
View Answer & Discuss (13) JAMB 1979
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