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Chemistry Past Questions

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36
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is
  • A. Fe2+
  • B. Cl2
  • C. Fe3+
  • D. Cl-
  • E. H2O
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37
If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is
  • A. dilute sulphuric acid
  • B. dilute hydrochloric acid
  • C. unreacted hydrogen sulphide in water
  • D. iron (III) chloride
  • E. Iron (II) chloride
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38
Which of the following changes is physical?
  • A. Adding iron filing to aerated water
  • B. Adding sodium metal to water
  • C. Cooling a solution of Iron (II) sulphate to obtain the hydrated salt
  • D. Cooling water to obtain ice
  • E. Burning the domestic gas (Utilgas) for cooking
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39
By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and
  • A. potassium nitrate
  • B. sand
  • C. lead nitrate
  • D. sugar (glucose)
  • E. starch
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40
In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?
  • A. in the beaker
  • B. in the conical flask
  • C. in a burette
  • D. in the standard flask
  • E. in the measuring cylinder
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