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Chemistry Past Questions

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2991
An element with atomic number twelve is likely to be
  • A. electrovalent with a velocity of 1
  • B. electrovalent with a valency of 2
  • C. covalent with a valency of 2
  • D. covalent with valency of 4
View Answer & Discuss (5) JAMB 1986
2992

Which of the following groups of physical properties increases from left to right of the periodic table?

i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electron affinity

  • A. i and ii
  • B. i, ii and iii
  • C. iii and iv
  • D. i, iii and iv
View Answer & Discuss (8) JAMB 1986
2993
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
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2994
Which of the following conduct electricity?
  • A. sulfur
  • B. graphite
  • C. diamond
  • D. red phosphorus
  • E. yellow phosphorus
View Answer & Discuss (8) JAMB 1985
2995
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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