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2256
The reaction that takes place at the cathode when an aqueous solution of NaCI is electrolysed using carbon electrodes is
  • A. 2H+2(g) + 2e- → H2(g)
  • B. Na+2(g) + e- → Na(s)
  • C. 4OH- → 2H2O(l) + O2(g) +4e-
  • D. 2CI- → CI2(g) + 2e-
View Answer & Discuss WAEC 2004
2257
What of the following pairs of acid and base will produce a solution with pH less than 7 at equivalence point?
  • A. HNO3 and NaOH
  • B. H2SO4 and KOH
  • C. HCI and Mg(OH) 2
  • D. HNO 3 and KOH
View Answer & Discuss (5) WAEC 2004
2258
WHICH OF THE FOLLOWING SALTS IS READILY SOLUBLE IN WATER?
  • A. PbCI2
  • B. Pb(NO 3) 2
  • C. PbSO4
  • D. PbCO 3
View Answer & Discuss (1) WAEC 2004
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2259

Which of the following factors that affect the rate of chemical reactions can be explained in terms of the collision theory? l. concentration ll. pressure lll. temperature lV catalyst

  • A. l and ll only
  • B. l, ll and lll only
  • C. l and lll only
  • D. l, II, lll and IV only
View Answer & Discuss (11) WAEC 2004
2260
An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolating the dyes?
  • A. Fractional distillation
  • B. Paper chromatography
  • C. Coagulation
  • D. Recrystallization
View Answer & Discuss (1) WAEC 2004
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