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Chemistry 2009 JAMB Past Questions

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26

In the diagram above, which of the curves represents the evolution of oxygen with time in the equation 2KClO3(s) → 2KCl(s) + 3O2(g)?

  • A. X
  • B. Y
  • C. Z
  • D. R
View Answer & Discuss (5) JAMB 2009
27

A catalyst increase the rate of a chemical reaction by providing a path that?

  • A. raise the activiation energy
  • B. increase the temperature
  • C. lowers the activation energy
  • D. increase the concentration
View Answer & Discuss (1) JAMB 2009
28

CuO(s) + H\(_2\)(g) ↔ Cu(s) + H\(_2\)O(g)
What is the effect of increasing the pressure on the equilibrium reaction above?

  • A. The equilibrium is shifted to the left
  • B. The equilibrium is shifted to the right
  • C. There is no effect
  • D. More H2(g) is produced
View Answer & Discuss (9) JAMB 2009
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29
The equilibrium of an endothermic reaction which proceeds with an increase in volume can be shifted in the reverse direction by
  • A. increasing the temperature and decreasing the pressure
  • B. increasing the pressure and increasing the temperature
  • C. decreasing the temperature and increasing the pressure
  • D. decreasing the pressure and decreasing the temperature
View Answer & Discuss (5) JAMB 2009
30

The oxidation of ammonia in excess air produces?

  • A. NO
  • B. N2O
  • C. NO2
  • D. N2O4
View Answer & Discuss (8) JAMB 2009
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