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Chemistry 2010 JAMB Past Questions

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26

If a reaction is exothermic and there is a great disorder, it means that?

  • A. the reaction is static
  • B. the reaction is in a state of equilibrium
  • C. there will be a large increase in free energy
  • D. there will be a large decrease in free energy
View Answer & Discuss (9) JAMB 2010
27

In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by?

  • A. lowering the pressure of the reaction
  • B. increasing the surface area of the reactant
  • C. increase the rate of the reaction
  • D. lowering the energy barrier of the reaction
View Answer & Discuss (10) JAMB 2010
28

The graph above demonstrate the effect of?

  • A. surface area on the rate of reaction
  • B. catalyst on the rate of reaction
  • C. pressure on the rate reaction
  • D. concentration on the rate of reaction
View Answer & Discuss JAMB 2010
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29

2H2(g) + O2(g) ⇌ 2H2O(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?

  • A. it is unaffected
  • B. it becomes zero
  • C. it decrease
  • D. it increase
View Answer & Discuss (7) JAMB 2010
30

To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of?

  • A. CO\(^{2-}_{3}\)
  • B. Cl-
  • C. SO\(_{3}^{2-}\)
  • D. NO\(^{2-}_{3}\)
View Answer & Discuss (6) JAMB 2010
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