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1981

A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [CH\(_4\) = 16; SO\(_2\) = 64]

  • A. 5 seconds
  • B. 20 seconds
  • C. 40 seconds
  • D. 60 seconds
  • E. 80 seconds
View Answer & Discuss (8) WAEC 1997
1982
An acid is a substance which in the presence of water produces
  • A. salts
  • B. oxygen
  • C. effervescence
  • D. hydroxonium ions
  • E. hydrogen gas
View Answer & Discuss (1) WAEC 1997
1983
Which of the following is a general method of preparing acids?
  • A. Direct combination of constituent elements
  • B. Double decomposition involving a salt solution
  • C. Reaction between an anhydride and water
  • D. Reaction between a base and an amphoteric oxide
  • E. Dissolution of hydroxides followed by neutralization
View Answer & Discuss (2) WAEC 1997
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1984

Which of the following is a general method of preparing acids?

  • A. Direct combination of constituent elements
  • B. Reaction between a base and an amphoteric oxide
  • C. Double decomposition involving a salt solution
  • D. Reaction between an anhydride and water
  • E. Dissolution of hydroxides followed by neutralization
View Answer & Discuss (8) WAEC 1997
1985
The loss of molecules of water of crystallization to the atmosphere by some crystalline salts is known as
  • A. efflorescence
  • B. effervescence
  • C. phosphorescence
  • D. fluorescence
  • E. deliquescence
View Answer & Discuss (3) WAEC 1997
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