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Chemistry Past Questions

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191

Cu\(_2\)S(s) + O\(_2\)(g) → 2CU(s) + SO\(_2\)(g)
What is the change in the oxidation number of copper in the reaction above?

  • A. +1 to 0
  • B. 0 to +2
  • C. +2 to +1
  • D. 0 to +1
View Answer & Discuss (5) JAMB 2002
192

The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are

  • A. Hydrogen and oxygen gases
  • B. Water and hydrogen gas
  • C. Water and sodium metal
  • D. Sodium metal and oxygen gas
View Answer & Discuss (5) JAMB 2002
193
The solubility of a salt of molar mass 101g at 20oC is 0.34 mol dm-3. If 3.40g of the salt is dissolved completely in 250cm3 of water in a beaker, the resulting solution is
  • A. A suspension
  • B. Saturated
  • C. Unsaturated
  • D. Supersaturated
View Answer & Discuss (6) JAMB 2002
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194

Tetraoxosulphate (VI) acid burns the skin by

  • A. Hydrolysis
  • B. Hydration
  • C. Heating
  • D. Dehydration
View Answer & Discuss (5) JAMB 2002
195

When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be

  • A. Efflorescence
  • B. Deliquescence
  • C. Effervescence
  • D. Fluorescence
View Answer & Discuss (9) JAMB 2002
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