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Chemistry WAEC Past Questions

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211
In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of
  • A. definite proportion
  • B. conservation of matter
  • C. multiple proportions
  • D. reciprocal proportions
  • E. constant composition
View Answer & Discuss (2) WAEC 1994
212

Which of the following is not a property of magnesium oxide?

  • A. High melting point
  • B. Dissolution in polar solvents
  • C. Presence of ionic bonds
  • D. Possession of crystal lattice
  • E. Low binding energy
View Answer & Discuss (4) WAEC 1994
213
Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M(s) + 2HCI(aq) → MCI2(aq) + H2(g)
  • A. Diluting the hydrochloric acid
  • B. Adding some distilled water
  • C. Decreasing the temperature
  • D. Grinding the metal into powder
  • E. Increasing the pressure
View Answer & Discuss (1) WAEC 1994
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214

The oxidation number of phosphorus in \(PO_4^{3-}\) is

  • A. + 1
  • B. +2
  • C. +3
  • D. +4
  • E. +5
View Answer & Discuss (11) WAEC 1994
215
The number of atoms in 1.2g of carbon - 12 isotope is
  • A. 1.00 x 10 22
  • B. 6.02 x 1022
  • C. 1.20 x 10 23
  • D. 1.00 x 1023
  • E. 6.02 x 1024
View Answer & Discuss (2) WAEC 1994
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