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Chemistry Past Questions

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2246
What volume of hydrogen would be left over when 300cm3 of oxygen and 1000cm of hydrogen are exploded in a sealed tube? [2H2(g) + O2(g) → 2H2 Og]
  • A. 200 cm3
  • B. 400 cm3
  • C. 600cm3
  • D. 700cm3
View Answer & Discuss (3) WAEC 2004
2247

What are the values of x, y and z respectively in the following in the following equation? \(MnO_{2(s)} + xHCI_{(aq)} → MnCI_{2(g)} + yHO_{(l)} + zCI_{2(g)}\)

  • A. 4,1,2
  • B. 1,2,1
  • C. 2,1,2
  • D. 4,2,1
View Answer & Discuss (6) WAEC 2004
2248
Which of the following subtances will not produce effervescence with dilute hydeochloric acid?
  • A. Copper (ll) trioxocarbonate (IV)
  • B. Potassium hydrogentrioxocarbonate (lV)
  • C. Zinc granules
  • D. Sodium chloride
View Answer & Discuss (1) WAEC 2004
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2249
What quantity of electrons in moles is needed to discharge two moles of aluminum from aluminum oxide (AI 2O3)
  • A. 1
  • B. 2
  • C. 4
  • D. 6
View Answer & Discuss (1) WAEC 2004
2250

Two solutions containing Pb2+ and AI3+ respectively can be distinguished using

  • A. NaOH(aq)
  • B. NH3(aq)
  • C. conc. HCI3
  • D. conc. HCI
View Answer & Discuss (1) WAEC 2004
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