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REDOX REACTIONS AND ELECTROCHEMISTRY
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Which of the following illustrates that excess reducing agent forms lower oxidation state?
A. S burned in air gives SO3
B. Fe³⁺ reduced to Fe²⁺ by Sn²⁺ in excess
C. CH4 oxidized by excess O2 to CO2
D. KMnO4 reduced to MnO2 in basic medium
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