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Which of the following reaction takes place at anode in hydrogen-oxygen fuel cell?(a) \(H_2+\frac{1}{2}O_2\rightarrow H_2 O\)(b) \(H_2 O \rightarrow H_2+ O_2\)(c) \(H_2+2OH^-\rightarrow 2H_2 O+ 2e^-\)(d) \(O_2+H_2 O+ 2e^-\rightarrow HO_2^-+ OH^-\)I had been asked this question in class test.Question is from Inorganic Chemical topic in division Inorganic Chemical Industries of Chemical Technology

Answer»

Correct answer is (c) \(H_2+2OH^-\rightarrow 2H_2 O+ 2E^-\)

EXPLANATION: \(H_2+\frac{1}{2}O_2\rightarrow H_2 O\) is an overall reaction WHEREAS\(H_2 O \rightarrow H_2+ O_2\)is an unbalanced reaction. \(O_2+H_2 O+ 2e^-\rightarrow HO_2^-+ OH^-\)is a reduction reaction which takes place at cathode, and \(H_2+2OH^-\rightarrow 2H_2 O+ 2e^-\) is the anodic reaction (OXIDATION reaction).


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