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Chemistry Past Questions

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406

Zinc and carbon rods are used as anode and cathode respectively in a

  • A. Leclanche cell
  • B. lead accumulator
  • C. Daniel cell
  • D. voltaic cell
View Answer & Discuss (5) JAMB 2006
407

The solution that will conduct the highest amount of electricity is?

  • A. 0.5 mol dm-3 of hydrochloric acid
  • B. 2.0 mol dm-3 of hydrochloric acid
  • C. 0.5 mol dm-3 ethanoic acid
  • D. 2.0 mol dm-3 ethanoic acid
View Answer & Discuss (28) JAMB 2006
408

In which of the following is the oxidation number of sulphur equal to - 2?

  • A. SO3
  • B. S8
  • C. H2S
  • D. SO2
View Answer & Discuss (4) JAMB 2006
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409

In the electrolysis of CuSO\(_4\)(g) using platinum electrodes, the reaction at the anode is

  • A. 4H+ + 4e- → 2H2
  • B. 4OH- + 4e- → 2H2O + O2
  • C. 2OH - 2e- → 2OH
  • D. 2OH- + 2OH- → 2H2O + O2
View Answer & Discuss (5) JAMB 2006
410

Na\(_2\)CO\(_3\)(g) + 2HCl(aq) → 2NaCl(aq) + H\(_2\)O(l) + CO\(_2\)(g)
How many moles of sodium trioxocarbonate (IV) are there in a 25 cm\(^3\) solution which required 10cm\(^3\) of 0.05 mol dm\(^3\) hydrochloric acid solution to neutralize it?

  • A. 1.000 mole
  • B. 0.100 mole
  • C. 0.010 mole`
  • D. 0.111 mole
View Answer & Discuss (21) JAMB 2006
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