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18 June, 07:39

Which equation represents an oxidation-reduction reaction?

a. hcl + koh? kcl + h2o

b. 4hcl + mno2? mncl2 + 2h2o + cl2

c. 2hcl + caco3? cacl2 + h2o + co2

d. 2hcl + fes? fecl2 + h2s?

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Answers (1)
  1. 18 June, 07:48
    0
    In an oxidation-reduction reaction there is an exchange of electrons.

    The exchange of electrons implies change in the oxidation states: at least one element increases its oxidation number while other reduces it.

    By simple ispection you can predict that in the equation b. there is a change in oxidation states of Cl and Mn.

    Now you can check it:

    Equation 4H Cl + Mn O2 - > Mn Cl2 + 2H2 O + Cl2

    oxidation sates 1 + 1 - 4 + 2 - 2 + 1 - 1 + 2 - 0

    The oxidation state of Cl in HCl is 1 - and it changed to 0 in Cl2

    The oxidation state of Mn in MnO2 is 4 + and it changed to 2 + in MnCl2

    Answer b.
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