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Chemistry WAEC Past Questions

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66
The electronic configuration of two atoms X and Y are as follows: X - 1s 2 2s 22p 63s 1, Y -1s 22s 22p 63s23p 64s 2 which of the statements below is true of the position of X and Y in the Periodic Table?
  • A. x belongs to group 1, Y belongs to period 2,
  • B. x belongs to group 1, Y belongs to period 4
  • C. x belongs to group 2, Y belongs to period 1
  • D. x belongs to group 3, Y belongs to period 2
  • E. x belongs to group 3, Y belongs to period 4
View Answer & Discuss (6) WAEC 1989
67
Which of the following is a condition for a spontaneous reaction?
  • A. ∆H -T is zero
  • B. ∆H-T∆ S is positive
  • C. ∆H-T∆ S is negative
  • D. ∆S is zero
  • E. ∆S is positive
View Answer & Discuss (3) WAEC 1989
68

50cm 3 of a saturated solution of potassium trioxonitrate (V)at 40°C contains 5.05g of the salt. What is the solubility of potassium trioxonitrate (V) at 40°C? (KNO3 = 101)

  • A. 1.0 mol dm-3
  • B. 1.5 mol dm-3
  • C. 2.0 mol dm-3
  • D. 2.5mol dm-3
  • E. 5.0mol dm-3
View Answer & Discuss (8) WAEC 1989
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
69
The oxidation number of chlorine is + 1 in
  • A. KCIO 3
  • B. CI 2O 7
  • C. ZnCI2
  • D. HCI
  • E. NaCIO
View Answer & Discuss (4) WAEC 1989
70

What is the voltage of the cell represented at Zn(s)/ Zn\(^{2+}\)(aq) //Cu\(^{2+}\)(aq) /Cu(s) given that for Cu\(^{2+}\)(aq)/ Cu (s) E\(^0\) = 0.337V and for Zn\(^{2+}\)(aq) /Zn(s)' E\(^0\) = - 0.763V?

  • A. +0.426V
  • B. -0.426V
  • C. -0.337V
  • D. -1.10V
  • E. +1.10V
View Answer & Discuss (6) WAEC 1989
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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