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REDOX REACTIONS AND ELECTROCHEMISTRY
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Question
Which example illustrates formation of lower oxidation state with excess reductant?
A. Cl₂ oxidizing Fe²⁺ to Fe³⁺
B. S burning in air gives SO₂
C. Excess H₂ reduces CuO to Cu
D. Sn²⁺ reducing Fe³⁺ to Fe²⁺ when in excess
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