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Chemistry 1991 JAMB Past Questions

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11
The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons.
How many protons are in the nuclei of the neutral atoms of X and Y respectively?
  • A. 10 and 10
  • B. 9 and 9
  • C. 11 and 9
  • D. 9 and 11
View Answer & Discuss (12) JAMB 1991
12
Which of the following represents the type of bonding present in ammonium chloride molecule?
  • A. Ionic only
  • B. Covalent only
  • C. Ionic and dative covalent
  • D. Dative covalent only
View Answer & Discuss (14) JAMB 1991
13
Which of the following is arranged in order of increasing electronegativity?
  • A. Chlorine, aluminium, magnesium, phosphorus, sodium
  • B. sodium, magnesium, aluminium, phosphorus, chlorine
  • C. Chlorine, phosphorus, phosphorous, aluminium, magnesium, sodium
  • D. Sodium, chlorine, phosphorus, magnesium, aluminium
View Answer & Discuss (5) JAMB 1991
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14
A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of?
  • A. nitrogen
  • B. neon
  • C. argon
  • D. oxygen
View Answer & Discuss (5) JAMB 1991
15
Which of the following ions is a pollutant in drinking water even in trace amounts?
  • A. Ca2+
  • B. Hg2+
  • C. Mg2+
  • D. Fe2+
View Answer & Discuss (10) JAMB 1991
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