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Chemistry Past Questions

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246

Which of the following will change when a catalyst is added to a chemical reaction?

  • A. The activation energy
  • B. The potential energy of the reactants
  • C. The heat of the reaction
  • D. the potential energy of the product
View Answer & Discuss (3) JAMB 2003
247

If y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?

  • A. Y increases in oxidation number
  • B. Y becomes reduced
  • C. Z loses protons
  • D. Z gains protons
View Answer & Discuss (6) JAMB 2003
248

When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant?

  • A. 2SO3(g) ↔ 2SO2(g) + O2(g)
  • B. 2CO2(g) ↔ 2CO(g) + O2(g)
  • C. 2H2(g) + O2(g) ↔ 2H2O(g)
  • D. 2NO(g) ↔ N2(g) + O2(g)
View Answer & Discuss (14) JAMB 2003
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249

In the electrolysis of a concentrated solution of sodium chloride using electrodes, which of the following ions are discharged at the cathode and anode respectively?

  • A. Na+ and Cl-
  • B. Na+ and OH-
  • C. H+ and OH-
  • D. H+ and Cl-
View Answer & Discuss (39) JAMB 2003
250

CO(g) + H2O(g) → CO2(g) + H2(g)
From the reaction above, calculate the standard enthalpies of formation if CO2(g), H2O(g) and CO(g) in kJ mol-1 are -394, -242, and -110 respectively.

  • A. -262 kJ mol-1
  • B. -42 kJ mol-1
  • C. +42 kJ mol-1
  • D. +262 kJ mol-1
View Answer & Discuss (12) JAMB 2003
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