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106
When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is
  • A. carbon (IV) oxide
  • B. nitrogen
  • C. oxygen
  • D. water vapour
  • E. noble gases
View Answer & Discuss (2) WAEC 1991
107
What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3 g of the compound? (Na2CO3 = 106)
  • A. 0.05
  • B. 0.10
  • C. 0.20
  • D. 0.50
  • E. 2.00
View Answer & Discuss (3) WAEC 1991
108

Which of the processes represented by the following equations has the greatest positive entropy change?

  • A. C6H3(l) → C6H 6 (g)
  • B. H2O (s) → H2O(l)
  • C. CuO(s) + H2(g) → Cu(s) + H2
  • D. Na2CO3(s) + nH2O(l) →Na 2CO3nH2O(s)
  • E. S(s) → S(l)
View Answer & Discuss (1) WAEC 1991
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109
Which of the following elements can from more than one acidic oxide?
  • A. Hydrogen
  • B. Sulphur
  • C. Carbon
  • D. Alumium
  • E. Iron
View Answer & Discuss WAEC 1991
110
CH2 = CH2 + H2SO4 → CH3 - CH2 -OSO3H. The reaction illustrated by the equation above is an example of
  • A. substitution
  • B. oxidation
  • C. reduction
  • D. addition
  • E. displacement
View Answer & Discuss (3) WAEC 1991
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