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Chemistry WAEC Past Questions

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916

Consider the reaction represented by the following equation: C\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\). The value of y in the reaction is

  • A. 4
  • B. 3
  • C. 2
  • D. 1
View Answer & Discuss (3) WAEC 2013
917

The volume of 0.25 moldm-3 solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00)

  • A. 464.30 cm3
  • B. 625.00 cm3
  • C. 1000.00 cm3
  • D. 2153.80 cm3
View Answer & Discuss (9) WAEC 2013
918

The percentage by mass of calcium in Ca(OCI)2 is [Ca = 40.0; CI = 35.5; O = 16.0]

  • A. 28.0%
  • B. 31.6%
  • C. 43.8%
  • D. 44.5%
View Answer & Discuss (8) WAEC 2013
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919
The gas law which describes the relationship between volume and temperature is
  • A. Boyle's law
  • B. Charles' law
  • C. Dalton's law
  • D. Graham's law
View Answer & Discuss (2) WAEC 2013
920
Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
  • A. Brownian motion
  • B. Diffusion
  • C. Evaporation
  • D. Sublimation
View Answer & Discuss WAEC 2013
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