GRE Subject Test: Chemistry : Oxidation-Reduction Reactions
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Example Questions
Example Question #12 : Reaction Chemistry
Based on the chemical equation given, which of the following compounds underwent reduction?
The type of chemical reaction given is called an oxidation-reduction reaction. In this type of reaction, there is a transfer of electrons from one element to another. The species gaining an electron is said to be reduced and the species losing an electron is oxidized. Manganese ion goes from a 
Example Question #1 : Oxidation Reduction Reactions
Methane combusts in the presence of oxygen according to the following reaction:
Which of the following statements is true concerning the reaction?
Carbon is oxidized in the reaction
Carbon has an initial oxidation state of
Oxygen has a charge of 
Oxygen is oxidized in the reaction
Carbon is oxidized in the reaction
By comparing the oxidation number of an atom as a reactant and its oxidation number as a product, we can determine if the atom has been oxidized or reduced. In increase in oxidation number indicates a loss of electrons, or oxidation. A decrease in oxidation number signals a gain of electrons, or reduction.
For electrochemistry, you should familiarize yourself with the traditional oxidation states of hydrogen 
Carbon is initially in the form of methane, meaning that it is attached to four hydrogen atoms. The molecule is neutral, and each hydrogen has an oxidation number of 
In the a product, carbon is attached to two oxygens, each with a charge of 
Since carbon went from an oxidation state of 
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