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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
2711
Which of the following substances increases in mass when heated in air?
  • A. Sodium chloride
  • B. lodine crystals
  • C. Magnesium ribbon
  • D. Copper (ll) oxide
View Answer & Discuss (1) WAEC 2002
2712
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution. [NaOH = 40 g mol-1]
  • A. 0.0156 g
  • B. 0.625 g
  • C. 1.00 g
  • D. 25.0 g
View Answer & Discuss (5) WAEC 2002
2713
Which of the following salt solutions will have a pH greater than 7?
  • A. NaCI(aq)
  • B. Na2CO3(aq)
  • C. Na2SO4(aq)
  • D. NaHSO4(aq)
View Answer & Discuss (5) WAEC 2002
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2714

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 (9) WAEC 2002
2715
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 (7) WAEC 2002
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