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Chemistry 2007 WAEC Past Questions

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11
14.8 g of a salt (z)dissolved in 250 cm3 of distilled water gives a concentration of 0.80 mol dm-3. Calculate the molar mass of the salt (z).
  • A. 13.5 g mol-1
  • B. 18.5 g mol-1
  • C. 47.4 g mol-1
  • D. 74.0 g mol-1
View Answer & Discuss (2) WAEC 2007
12

How many atoms are there in one mole of hydrogen gas? [Avogadro's constant = 6.02 x 1023mol-1]

  • A. 1.2 x 10 23
  • B. 6.0 x 10 23
  • C. 1.2 x10 24
  • D. 6.0 x 10 24
View Answer & Discuss (3) WAEC 2007
13
What is the IUPAC name of the compound represented by the molecular formula NaCIO4?
  • A. Sodium tetraoxochlorate (l)
  • B. Sodium tetraoxochlorate (IV)
  • C. Sodium tetraoxochlorate (VI)
  • D. Sodium tetraoxochlorate(VII)
View Answer & Discuss (2) WAEC 2007
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14
When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are
  • A. oxygen and water vapour
  • B. oxygen and nitrogen
  • C. carbon (IV) acid and noble gases
  • D. nitrogen and noble gases
View Answer & Discuss WAEC 2007
15
Which of the following gases is light than air?
  • A. CO2
  • B. SO2
  • C. HCI
  • D. NH3
View Answer & Discuss (1) WAEC 2007
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