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Chemistry WAEC Past Questions

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1841

A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn

  • A. acidified K\(_{2}\)Cr\(_{2}\)O\(_{7}\) solution colourless
  • B. acidified KMnO\(_{4}\) solution colourless
  • C. Fe(NO\(_{3}\))\(_{2}\) solution green
  • D. Pb(NO\(_{3}\))\(_{2}\) paper black
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1842

If 5.0 g of marble reacts with 25.0 cm3 hydrochloric acid, which of the following combinations has the fastest reaction rate?

  • A. Marble chips and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
  • B. Marble chips and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
  • C. Powdered marble and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
  • D. Powdered marble and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
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1843

Increasing the temperature generally

  • A. decreases the solubility of a solid in a liquid but increases the solubility of a gas in a liquid.
  • B. increases the solubility of a solid in a liquid but decreases the solubility of a gas in a liquid.
  • C. increases the solubility of both a solid and a gas in a liquid
  • D. decreases the solubility of both a solid and a gas in a liquid
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1844

A white precipitate was formed when BaCl\(_{2(aq)}\) was added to an aqueous solution
of a salt X. The precipitate dissolved in dilute HCl with rapid effervescence. Salt X is likely to contain

  • A. SO\(_{4}\) \(^{2-}\) ions
  • B. SO\(_{3}\) \(^{2-}\) ions
  • C. NO\(_{3}\)- ions
  • D. CO\(_{3}\) \(^{2-}\)- ions
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1845

Before a reaction could take place, there should be

  • A. ionization of reactant particles
  • B. breakage of bonds of products
  • C. breakage of bonds of reactants
  • C. ionization of product particles
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