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Chemistry 2024 WAEC Past Questions

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16

Which of the following statements describes transition elements? They

  • A. are very reactive
  • B. have low melting points
  • C. possess variable oxidation state
  • D. form colourless salts
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17

Aluminium is suitable for making alloys for aircraft construction because it

  • A. is hard and brittle
  • B. is light and very resistant to corrosion
  • C. has high density and also a non-conductor of electricity
  • D. is amphoteric and allotropic
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18

Which of the following arrangements of elements is in order of increasing ionization energy?

  • A. Si, Al, S, P
  • B. S, P, Si, Al
  • C. Al, Si, P, S
  • D. P, Si, S, Al
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19

Consider the reaction represented by the equation:

   C\(_3\)H\(_8\)  +  5 O\(_2\)  → 3CO\(_2\)  +  4H\(_2\)O

If 0.1 mole of  C\(_3\)H\(_8\) was completely burnt, what volume of CO\(_2\) would be produced at stp? [volume of gas at stp = 22.4dm\(^3\)mol\(^{-1}\)].

  • A. 6.72dm\(^3\)
  • B. 2.24dm\(^3\)
  • C. 0.30 dm\(^3\)
  • D. 0.10dm\(^3\)
View Answer & Discuss (3) WAEC 2024
20

Naturally occurring Boron is made up of 19.9% \(^{10}\)B and 80.1% \(^{11}\)B. The relative atomic mass of Boron is

  • A. 21.0
  • B. 10.8
  • C. 10.5
  • D. 10.0
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