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Chemistry JAMB Past Questions

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1751
When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
  • A. 10.0 moles dm-3
  • B. 7.0 moles dm-3
  • C. 3.5 moles dm-3
  • D. 2.0 moles dm-3
View Answer & Discuss (16) JAMB 1986
1752
Which of the following conduct electricity?
  • A. sulfur
  • B. graphite
  • C. diamond
  • D. red phosphorus
  • E. yellow phosphorus
View Answer & Discuss (8) JAMB 1985
1753
An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is
  • A. C8H22O3
  • B. C6H10O3
  • C. C12H12O
  • D. C6H12O
  • E. C3H6O
View Answer & Discuss (6) JAMB 1985
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1754
0.499g 0f CuSO4.xH2O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)
  • A. 0.5
  • B. 2.0
  • C. 3.0
  • D. 4.0
  • E. 5.0
View Answer & Discuss (14) JAMB 1985
1755
In the experiment, which of the following observations would suggest that a solid sample is a mixture? The
  • A. solid can be ground to a fine powder
  • B. density of the solid is 2.25gdm-3
  • C. solid begins to melt at 573k but is not completely melted until 648k
  • D. solid absorbs moisture from the atmosphere and turns into liquid
  • E. solid melts at 300k
View Answer & Discuss (1) JAMB 1985
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