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Chemistry JAMB Past Questions

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576

Iron can be protected from corrosion by coating the surface with?

  • A. gold
  • B. silver
  • C. copper
  • D. zinc
View Answer & Discuss (16) JAMB 2010
577

What quantity of aluminum is deposited when a current of 10A is passed through a solution of an aluminum salt for 1930s?
[Al = 27, F = 96500 C mol -1]

  • A. 0.2 g
  • B. 1.8 g
  • C. 5.4 g
  • D. 14.2 g
View Answer & Discuss (21) JAMB 2010
578

In which of the following is the entropy change positive?

  • A. Thermal dissociation of ammonium chloride
  • B. Reaction between an acid and a base
  • C. Addition of concentrated acid to water
  • D. Dissolution of sodium metal in water
View Answer & Discuss (8) JAMB 2010
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579

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
580

In the preparation of oxygen by heating KClO\(_3\) in the presence of MnO\(_2\), 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 (21) JAMB 2010
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