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536
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
537

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
538
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
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539
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
540
Which of the following acids is dibasic?
  • A. Hydrochloric acid
  • B. Trioxosulphate (IV) acid
  • C. Dioxonitrate (lll) acid
  • D. Ethanoic acid
View Answer & Discuss WAEC 2003
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