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Chemistry 2022 WAEC Past Questions

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46

The atom with the electron configuration
1s\(^{2}\)2s\(^{2}\)2p63s\(^{2}\)3p\(^{6}\)3d\(^{10}\)4s\(^{2}\)4p\(^{4}\) is in

  • A. period 4, p- block
  • B. period 3, p- block
  • C. period 4, d- block
  • D. period 3, d- block
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47

Electropositivity of elements across the periodic table normally

  • A. remains constant down the group
  • B. increases across the period
  • C. decreases across the period
  • D. decreases down the group
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48

Consider the following table

Substitute Meltig point / ºC Boiling  point / ºC
P - 78 -25
Q - 8 40
R  - 6 150
S 44 280


Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?

  • A. P
  • B. Q
  • C. R
  • D. S
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49

Which of the following oxides is amphoteric?

  • A. Carbon(II) oxide
  • B. Nitrogen(IV) oxide
  • C. Lead(II) oxide
  • D. Calcium oxide
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50

Which of the following processes occur during fractional distillation of petroleum?

  • A. Condensation and diffusion
  • B. Diffusion and evaporation
  • C. Diffusion and sublimation
  • D. Evaporation and condensation
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