14 Oxidation and Reduction Reactions MCQ1
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Questions and Answers

What is the purpose of adding dilute HCl in the test for sulfites?

  • To form a green precipitate
  • To oxidise the sulphite
  • To reduce the sulphite
  • To dissolve the white precipitate (correct)

    • Which of the following is NOT a common oxidising agent?

  • Oxygen
  • Sodium dichromate
  • Sodium chloride (correct)
  • Hydrogen peroxide

    • What is the colour of the solution when bromine water is added to potassium iodide?

  • Colourless
  • Green
  • Red-brown (correct)
  • Orange

    • What is the function of an oxidising agent in a reaction?

    <p>To allow oxidation to happen by gaining electrons</p> Signup and view all the answers

    What is the purpose of the test for Fe2+?

    <p>To ensure no Fe3+ is present</p> Signup and view all the answers

    What is the colour of the precipitate formed when BaCl₂ is added to a sulphite solution?

    <p>White</p> Signup and view all the answers

    What is the colour of the precipitate formed when chlorine is added to a Fe(II) solution?

    <p>Red-Brown</p> Signup and view all the answers

    What indicates the presence of Fe 3+ ions in a solution?

    <p>An orange-brown precipitate</p> Signup and view all the answers

    What is added to the test tube to detect the presence of nitrate ions?

    <p>Iron II sulphate and concentrated sulphuric acid</p> Signup and view all the answers

    What is the result of the test for nitrate ions?

    <p>A brown ring formed near the bottom of the test tube</p> Signup and view all the answers

    What is the result of adding silver nitrate to a chloride solution?

    <p>A white precipitate</p> Signup and view all the answers

    What is the result of adding magnesium sulfate to a carbonate solution?

    <p>A white precipitate</p> Signup and view all the answers

    What is the result of adding ammonium molybdate to a phosphate solution?

    <p>A white precipitate</p> Signup and view all the answers

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