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Chemistry JAMB Past Questions

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486

A catalyst speeds up the rate of chemical reaction by

  • A. taking part in the reaction
  • B. increasing the activation energy of the reaction
  • C. lowering the activation energy of the reaction
  • D. increasing the heat content
View Answer & Discuss (4) JAMB 2008
487

The rate of a reaction usually decreases with a decrease in the concentration of reactants because

  • A. kinetic energy decrease
  • B. temperature increase
  • C. speed increases
  • D. reactants collision decrease
View Answer & Discuss (7) JAMB 2008
488

The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is

  • A. oxygen
  • B. chlorine
  • C. nitrogen
  • D. hydrogen
View Answer & Discuss (9) JAMB 2008
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489

Which of the following compounds of trioxonitrate (V) will decompose to give dinitrogen (i) oxide and water when heated?

  • A. NaNO3
  • B. Zn(NO3)2
  • C. Cu(NO3)2
  • D. NH4NO3
View Answer & Discuss (9) JAMB 2008
490

When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of

  • A. Ca2+
  • B. Na+
  • C. Zn2+
  • D. K+
View Answer & Discuss (4) JAMB 2008
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