Oxidation Number Rules
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Questions and Answers

What is the oxidation number of hydrogen in LiH?

  • +2
  • -1 (correct)
  • +1
  • 0

    • What is the sum of the oxidation numbers of all atoms in a compound?

  • The molecular mass of the compound
  • The charge on the ion
  • The number of atoms in the compound
  • Zero (correct)

    • What is the oxidation number of fluorine in its compounds?

  • +1
  • +2
  • 0
  • -1 (correct)

    • What is the oxidation number of oxygen in a compound?

    <p>Variable depending on the compound</p> Signup and view all the answers

    What is the characteristic of the oxidation number of transition elements?

    <p>Display several positive oxidation states</p> Signup and view all the answers

    What is the purpose of the rules for assigning oxidation numbers?

    <p>To determine the oxidation number of an element in a compound</p> Signup and view all the answers

    What is the result of an increase in the oxidation number of an element in a given substance?

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

    What is the role of an oxidising agent in a redox reaction?

    <p>To increase the oxidation number of an element</p> Signup and view all the answers

    What is the oxidation number of an element in a compound presented according to the notation given by Alfred Stock?

    <p>Expressed as a Roman numeral in parentheses</p> Signup and view all the answers

    What is the term for a reaction that involves a change in oxidation number of the interacting species?

    <p>Redox reaction</p> Signup and view all the answers

    What is the result of a decrease in the oxidation number of an element in a given substance?

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

    What is the term for a reagent that can lower the oxidation number of an element in a given substance?

    <p>Reducing agent</p> Signup and view all the answers

    What is the average oxidation number of sulphurs in the S 4O62– species?

    <p>2.5</p> Signup and view all the answers

    What is the conclusion about fractional oxidation state?

    <p>It should be taken with care and the reality is revealed by the structures only.</p> Signup and view all the answers

    What is the oxidation state of the sulphur atoms in the extremes of the S 4O6 species?

    <p>+5</p> Signup and view all the answers

    What is the oxidation number of the oxygen atom in the O2+ species?

    <p>+½</p> Signup and view all the answers

    What is the first step in the oxidation number method for writing equations for oxidation-reduction reactions?

    <p>Write the correct formula for each reactant and product.</p> Signup and view all the answers

    What is the characteristic of the oxidation states of the metal atoms in the compounds Fe3O4, Mn 3O4, and Pb3O4?

    <p>They are in a combination of whole numbers and fraction oxidation states.</p> Signup and view all the answers

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