CHEM1902 Main Group Chemistry
Tutorial 3 - 2015
Prof Robert J. Lancashire

Muliple Choice Questions
1. In which of the following reactions is H2O2 not acting as an oxidizing agent?
a) 2Fe2+ + H2O2 + 2H+ → 2Fe3+ + 2H2O
b) PbS + 4H2O2 → PbSO4 + 4H2O
c) 2I- + 2H2O2 + 2H+ → I2 + 2H2O
d) Mn2+ + H2O2 + 2OH- → MnO2 + 2H2O
e) Ag2O + 2H2O2 → 2Ag + O2 + H2O

Short Answer Questions
  1. You are provided with two liquids, one is H2O and the other is H2O2. Safety regulations now prohibit you from touching/tasting them so suggest chemical tests that could distinguish between them. Include the reagents and observations expected and show balanced equations for the reactions.

  2. Use the MO diagram below to determine the bond order for the following species and predict whether the bond lengths shown are consistent with your values.
    MO diagram for O2 species O2+ = 112 pm
    O2 = 121 pm
    O2- = 128 pm
    O22- = 149 pm

  3. With the aid of suitable equations describe how H2O2 can be produced industrially and on a small scale in the laboratory.

  4. Write balanced half equations and the net ionic equation for:
    i) the oxidation of Fe2+ by H2O2 in acidic solution.
    ii) the reaction between KMnO4 and H2O2 in acidic solution.
    iii) the reaction between acidified KBr and H2O2.

  5. Describe two uses of D2O, including the chief large scale use.

  6. With the aid of equations, describe how ozone is produced and destroyed in the upper atmosphere.

  7. How would you prepare ozone in the laboratory? What conditions and safety equipment would be needed?

  8. What experiment/techniques could be used to distinguish between O3 and O2?

  9. How does the O-O bond length in O3 of 127.2 pm compare to the data above for O2 species?

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The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created November 2014. Links checked and/or last modified 16th February 2015.