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Chemistry 2002 WAEC Past Questions

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31

What will happen if more heat is applied to the following system at equilibrium?

X\(_2\)(g) + 3Y\(_2\)(g) ⇌ 2XY\(_3\)(g); ∆H = xKJmol\(^{-1}\)

  • 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 remain static
View Answer & Discuss (7) WAEC 2002
32
What is the expression for the equilibrium constant (Kc) for the following reaction? N2(g) + O2(g) ⇌ 2NO(g)
  • A. \(\frac{[NO^2]}{[N^2] + [O^2]}\)
  • B. \(\frac{[2NO]^2}{[N_2][O_2]}\)
  • C. \(\frac{[N_2] + [O_2]}{2[NO]^2}\)
  • D. \(\frac{[NO]^2}{[N_2][O^2]}\)
View Answer & Discuss (6) WAEC 2002
33

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 evoluton of gas
  • B. Total mass of gas evolved during the reaction
  • C. Time taken for the reaction to reach completion
  • D. Initial reaction rates
View Answer & Discuss (2) WAEC 2002
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34
CuSO45H2O 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 (1) WAEC 2002
35
Which of the following compounds will leave a metal residue when heated?
  • A. Cu(NO3)2
  • B. AgNO3
  • C. K2CO3
  • D. CaCO3
View Answer & Discuss WAEC 2002
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709