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Chemistry 2001 WAEC Past Questions

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46

Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution [NaOH = 40 g mol]

  • A. 0.0156 g
  • B. 0.625 g
  • C. 1.00 g
  • D. 25. 0 g
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47
Which of the following salt solutions will have a pH greater than 7?
  • A. NaCl(aq)
  • B. Na2CO3(aq)
  • C. Na2SO4(aq)
  • D. NaHSO4(aq)
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48
What will happen if more heat is applied to the following system at equilibrium? X2(g) + 3Y 2(g) ⇌ 2XY3(g); ∆H =-kJmol -1
  • A. the yield of XY 3 will decompose
  • B. more of XY3 will decompose
  • C. More of X2 will react
  • D. the forward reaction will go to completion
View Answer & Discuss WAEC 2001
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49
Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations . if all the marble chips reacted, which of the following remained the same in each case?
  • A. Average rate of evolution of gas
  • B. Total mass of gas evolved during the reaction
  • C. Time taken for the reaction to reach completion
  • D. lnitial reaction rates
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50
CuSO4 5H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by
  • A. evaporation to dryness
  • B. using chromatography
  • C. precipitation
  • D. crystallization
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