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Chemistry 2006 WAEC Past Questions

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11
When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.
  • A. ZnCl2(aq)
  • B. Pb(NO3)2(aq)
  • C. CuSO4(aq)
  • D. FeSO4(aq)
View Answer & Discuss (1) WAEC 2006
12
Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?
  • A. FeCI3
  • B. MgSO4.7H2O
  • C. Na2SO 4
  • D. KCI
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13

Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\) ⇌ 2SO\(_{3(g)}\); ∆H = - 197 kJmol\(^{-1}\). Which of the following conditions will not increase the yield of sulphur (VI) oxide?

  • A. Increase in temperature
  • B. Decrease in temperature
  • C. Increase in pressure
  • D. Addition of O2 into the mixture
View Answer & Discuss (7) WAEC 2006
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14
Electrolysis is applied in the following processes except
  • A. electroplating
  • B. extraction of aluminium
  • C. extraction of iron
  • D. purification of copper
View Answer & Discuss (5) WAEC 2006
15
The oxidation number of iodine in the iodate ion (IO -3) is
  • A. -5
  • B. -1
  • C. +1
  • D. +5
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208