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2946
When air is passed through alkaline pyrogallol and then lime water, the gases left are
  • A. nitrogen and carbon (IV) oxide
  • B. nitrogen and noble gases
  • C. nitrogen and oxygen
  • D. nitrogen, carbon (VI) oxide and noble gases
  • E. the noble gases
View Answer & Discuss (1) NECO 2009
2947

How many zones are present in a luminous Bunsen burner flame?

  • A. 2
  • B. 3
  • C. 4
  • D. 5
  • E. 6
View Answer & Discuss (19) NECO 2009
2948

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

  • A. 0.32
  • B. 0.64
  • C. 3.18
  • D. 6.35
  • E. 9.65
View Answer & Discuss (4) NECO 2009
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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2949
Which of the following metals is NOT extracted by electrolysis?
  • A. Aluminium
  • B. Calcium
  • C. iron
  • D. Magnesium
  • E. Sodium
View Answer & Discuss (1) NECO 2009
2950

The furring of kettles and boilers are caused by

  • A. calcium hydroxide
  • B. calcium hydrogen trioxocarbonate (IV)
  • C. calcium trioxocarbonate (IV)
  • D. calcium tetraoxocarbonate
  • E. magnesium tetraoxocarbonate (VI)
View Answer & Discuss (6) NECO 2009
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