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Chemistry 2007 WAEC Past Questions

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36
The following substances are heavy chemicals except
  • A. sodium trioxocarbonate (IV)
  • B. tetraoxosulphate (VI) acid
  • C. lead (lV) tetraethyl
  • D. sodium hydroxide
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37
Pig-iron is brittle because it contains
  • A. a high percentage of carbon as impurity
  • B. calcium trioxosilicate (IV)
  • C. unreacted haematite
  • D. undecomposed limestone
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38
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
  • A. 2.24 dm3
  • B. 5.60dm3
  • C. 11.20dm3
  • D. 44.80dm3
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39
Which of the these metals will not liberate hydrogen from dilute HCI?
  • A. Copper
  • B. Iron
  • C. Magnesium
  • D. Zinc
View Answer & Discuss (1) WAEC 2007
40

(a) Define the following terms:(i) Saturated solution; (ii) Solubility.

(b) In an experiment to determine the solubility of a given salt Y, the following data were provided:

Mass of dry empty dish = 7.16 g

Mass of dish + saturated solution of salt Y = 17.85 g

Mass of dish + salt Y = 9.30 g Temperature of solution = °C

Molar mass of salt Y = 100

Density of solution Y = 1.00 g cm\(^{-3}\) Calculate the solubility of salt Y in

(i) g dm\(^{-3}\) of solution, (ii) mol dm\(^{-3}\) of solution.

(c) State the type of bond broken on melting each of the following substances: (i) NaCI\(_{(s)}\) (ii) CO\(_{2(s)}\) (iii) SiO\(_{2(s)}\) (iv) Al\(_{(s)}\)

(d) Explain the following observations: (i) the chemical reactivity of alkali metals increases down the group; (ii) Mg has higher melting point than Na; (iii) K is a better reducing agent than Na.

(e)(i) What are isotopes? (ii) Lithium exists as \(^6_3\)Li and \(^7_3\)Li in the ratio 2:25. Calculate the relative atomic mass of the lithium.

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