Waec Chemistry Past Questions For Year 2001

Question 41

If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is

waec 2001

  • A. R(SO4)2
  • B. RSO4
  • C. R2SO4
  • D. R2(SO4)3
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Question 42

Which of the following salt solutions will have a pH greater than 7?

waec 2001

  • A. NaCl(aq)
  • B. Na2CO3(aq)
  • C. Na2SO4(aq)
  • D. NaHSO4(aq)
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Question 43

Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution [NaOH = 40 g mol]

waec 2001

  • A. 0.0156 g
  • B. 0.625 g
  • C. 1.00 g
  • D. 25. 0 g
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Question 44

Which of the following substances increases in mass when heated in air?

waec 2001

  • A. Sodium chloride
  • B. lodine crystals
  • C. magnesium ribbon
  • D. copper (ll) oxide
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Question 45

A substance is said to be hygroscopic if it absorbs?

waec 2001

  • A. water from the atmosphere to form a solution
  • B. heat from the surrounding
  • C. carbon (IV) oxide from the atmosphere
  • D. moisture from the atmosphere without dissolving
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