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Chemistry WAEC Past Questions

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521

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
522

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
View Answer & Discuss WAEC 2001
523

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
View Answer & Discuss WAEC 2001
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524

Which of the compounds will leave a metal residue when heated?

  • A. Cu(NO 3 )2
  • B. AgNO3
  • C. K2CO3
  • D. CaCO3
View Answer & Discuss (2) WAEC 2001
525

A visible change is observed when a strip of iron is placed in an aqueous solution of

  • A. FeSO4
  • B. ZnSO4
  • C. CuSO4
  • D. MgSO4
View Answer & Discuss (1) WAEC 2001
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