Question 5
An aqueous solution of hydrazine () is electrochemically oxidized by , thereby releasing chemical energy in the form of electrical energy. One of the products generated from the electrochemical reaction is .
Choose the correct statement(s) about the above process
ions react with at the anode to form and water, releasing 4 electrons to the anode.
At the cathode, breaks to and nascent hydrogen released at the electrode reacts with oxygen to form water.
At the cathode, molecular oxygen gets converted to .
Oxides of nitrogen are major by-products of the electrochemical process.
Detailed Solution
In a hydrazine-oxygen fuel cell operating in an alkaline medium:
- At the Anode (Oxidation): Hydrazine is oxidized. The reaction is:
This confirms option (A) is correct, as it correctly identifies the site (anode), reactants, products, and electron count.
- At the Cathode (Reduction): Oxygen is reduced. The reaction is:
This confirms option (C) is correct, as molecular oxygen is converted to hydroxide ions.
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Option (B) is incorrect because is oxidized at the anode, not the cathode, and the mechanism does not involve the formation of nascent hydrogen.
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Option (D) is incorrect because the primary product is and water; oxides of nitrogen are not produced as major by-products in this electrochemical reaction.
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