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2391
Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]
  • A. NH3 = 17
  • B. NH4CI = 53.5
  • C. NH4NO3 = 80
  • D. (NH3)2SO4 = 132
View Answer & Discuss (2) WAEC 2008
2392
If 5.00cm3 of 0.20 mol dm-3Na2CO3 was diluted with distilled water to obtain 250 cm3 solution, what is the concentration of the resulting solution?
  • A. 0.004 mol dm-3
  • B. 0.02 mol dm-3
  • C. 0.20mol dm-3
  • D. 0.40mol dm-3
View Answer & Discuss (3) WAEC 2008
2393
Consider the reaction represented by the following equation: Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm-3]
  • A. 1.12 dm3
  • B. 2.24dm3
  • C. 4.48dm3
  • D. 8.96dm3
View Answer & Discuss (3) WAEC 2008
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2394
Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35]
  • A. Chlorine
  • B. Hydrogen
  • C. Neon
  • D. Oxygen
View Answer & Discuss (3) WAEC 2008
2395
In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the
  • A. number of the collisions between the gas molecules and the walls of the container
  • B. kinetic energy of the gas
  • C. number of collisions between the gas molecules
  • D. number of repulsion between the gas molecules
View Answer & Discuss (4) WAEC 2008
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