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Homework Help: Na2SO4 + 4 C → Na2S + 4 CO

  1. Dec 7, 2009 #1
    1. The problem statement, all variables and given/known data
    20. Which substance gets reduced in the reaction below?
    Na2SO4 + 4 C → Na2S + 4 CO
    e.this is not an oxidation-reduction reaction

    2. Relevant equations

    3. The attempt at a solution
    i know how to find the oxidation numbers, but why is b the answer I don't understand why.
    Can anyone explain why? Thanks.
  2. jcsd
  3. Dec 8, 2009 #2
    Re: Redox

    A redox-reaction is when one substance is reduced and one is oxidized. Count all oxidation numbers and see how it changes.
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