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Chemistry Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
2196

The electronic configuration of an element is 1\(s^2\) 2\(s^2\) 2\(p^6\) 3\(s^2\) 3\(p^3\). Where is the element located in the periodic table?

  • A. Group lll, period 3
  • B. Group lll, period 5
  • C. Group V, period 3
  • D. Group V, period 5
View Answer & Discuss (7) WAEC 2003
2197
Group O of elements are unreactive because
  • A. their outmost shells contain equal number of electrons
  • B. their highest occupied enegy level is full
  • C. they are monatomic gases
  • D. they are non-metals
View Answer & Discuss (1) WAEC 2003
2198

An element X with electronic configuration \(1S^22S^22P^63S^2\) combines with another element Y with the configuration \(1S^2S^22P^23S^23P^5\). What is the formula of the compound formed?

  • A. X2Y5
  • B. X2Y3
  • C. XY3
  • D. XY2
View Answer & Discuss (11) WAEC 2003
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2199
Which of the following statements about dative bonding is not correct?
  • A. there is sharing of electrons
  • B. one atom must possess a lone pair electrons
  • C. each participating atom contributes one electron
  • D. it can be formed between molecules
View Answer & Discuss (4) WAEC 2003
2200
Which of the following quantities is the same for one mole of Br2(l) and one mole of He(g)?
  • A. Number of molecules
  • B. Number of atoms
  • C. Total mass of the particles
  • D. Volume occupied at s.t.p
View Answer & Discuss (10) WAEC 2003
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