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Chemistry WAEC Past Questions

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276

When an atom gains an electron, it becomes 

  • A. chemically inactive
  • B. negatively charged
  • C. oxidized
  • D. a cation
  • E. a complex ion
View Answer & Discuss (4) WAEC 1996
277
The alkali metals exhibit similar chemical properties because
  • A. they occur in the combined state
  • B. they have the same number of vallence electrons
  • C. they form crystalline salts
  • D. their salts are soluble in water
  • E. they are highly reactive
View Answer & Discuss WAEC 1996
278
What is the likely formula of compound formed between element M in group two and element X in group seven?
  • A. M7X2
  • B. M2X
  • C. M2X7
  • D. MX2
  • E. MX6
View Answer & Discuss WAEC 1996
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279
''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of
  • A. Charles Law
  • B. Boyle's Law
  • C. Avogadro's Law
  • D. Graham's Law
  • E. Gay Lussac's Law
View Answer & Discuss (2) WAEC 1996
280

What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]

  • A. 11.20dm3
  • B. 5.60dm3
  • C. 2.24dm3
  • D. 0.56dm3
  • E. 0.28dm3
View Answer & Discuss (4) WAEC 1996
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