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Chemistry 2015 JAMB Past Questions

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46
PCL5(g)= PCL3(g) + Cl2(g)

In the reaction above, a decrease in pressure will
  • A. Decelerate the reaction
  • B. Increase yield of Pcl3
  • C. Increase the yield of Pcl5
  • D. Accurate the reaction
View Answer & Discuss (5) JAMB 2015
47
Which of the following gives a precipitation when treated with NaOH Solution?
  • A. AlCl3
  • B. NH4Cl
  • C. Na2CO3
  • D. CH3COONa
View Answer & Discuss (1) JAMB 2015
48

Electronic configuration of an element 13 in the subsidiary energy level is

  • A. \( 1s^2 2s^2 2p^6 3s^2 3p^1 \)
  • B. \( 1s^22s^2 2p^4 3p^1 3s^1 \)
  • C. \( 1s^2 2s^2 2p^6 3s^2 3p^3 \)
  • D. \( 1s^1 2s^2 2p^6 3s^2 3p^4 \)
View Answer & Discuss (13) JAMB 2015
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49
Alloys are best prepared by
  • A. electroplating
  • B. Arc-welding
  • C. reducing and mixture of their metallic
  • D. cooking a molten of the metals
View Answer & Discuss (7) JAMB 2015
50

In countries where the temperature fall below 273k, salt always spilled on the road in order to

  • A. increase the boiling point
  • B. increase the density of the ice
  • C. make the ice impure
  • D. reduce the freezing point of ice
View Answer & Discuss (9) JAMB 2015
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