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Chemistry WAEC Past Questions

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526
Consider the following equation; Cr2O7(aq)2- + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(I). The oxidation number of chromium changes from
  • A. -2 to + 3
  • B. - 2 to + 6
  • C. + 6 to + 3
  • D. + 7 to + 6
View Answer & Discuss (4) WAEC 2002
527
Which of the following ions require the largest quantity of electricity for discharge at an electrode?
  • A. 2.0 mole of Q 3+
  • B. 2.5 mole of R2+
  • C. 4.0 mole of Y-
  • D. 3.0 mole of T-
View Answer & Discuss (1) WAEC 2002
528
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the
  • A. smaller mass
  • B. lower electrical charge
  • C. greater stability in solution
  • D. stronger tendency to accept electrons
View Answer & Discuss (4) WAEC 2002
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529

When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?

  • A. oxygen and hydrogen
  • B. hydrogen and oxygen
  • C. sodium and oxygen
  • D. soduim hydroxide, hydrogen and chlorine
View Answer & Discuss (8) WAEC 2002
530

Which of the following processes takes place during the production of margarine from vegetable oils?

  • A. Esterification
  • B. Hydrolysis
  • C. Hydrogenation
  • D. Saponification
View Answer & Discuss (2) WAEC 2002
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