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Chemistry WAEC Past Questions

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956

The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is

  • A. Na3Al(OH)4.
  • B. NaAl(OH)4
  • C. NaAl(OH)3
  • D. Na2Al(OH)3
View Answer & Discuss (2) WAEC 2012
957

The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together

  • A. l only
  • B. l and ll only
  • C. l and lll only
  • D. ll and lll only
View Answer & Discuss (1) WAEC 2012
958
MgO does not readily dissolve in water because
  • A. of its high melting point
  • B. it is a covalent compound
  • C. it forms a hydroxide when dissolved in water
  • D. its lattice energy is higher than its hydration energy
View Answer & Discuss WAEC 2012
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959

Consider the following reaction equation: CaCO\(_{3(s)}\) + 2HCI\(_{(aq)}\) → CaCl\(_{2(aq)}\) + H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\). What mass of CaCI\(_2\) would be obtained when 25.0g of CaCO\(_{3(s)}\) is reacted with excess HCI\(_{(aq)}\)? [CaCO\(_3 = 100; CaCI\(_2\) = 111]

  • A. 4.00g
  • B. 4.44 g
  • C. 18.9 g
  • D. 27.8 g
View Answer & Discuss (1) WAEC 2012
960

The number of sulphur atoms in 3.20g of SO\(_{2(g)}\) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 x 10\(^{23}\)]

  • A. 3.01 x 1022
  • B. 6.02 x 1022
  • C. 6.02 x1023
  • D. 1.20 x 1024
View Answer & Discuss (5) WAEC 2012
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