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An aqueous solution of hydrazine ( N ₂ H ₄ ) is electrochemically oxidized by O ₂ , thereby releasing chemical energy in the form of electrical energy. One of the products generated from the electrochemical reaction is N ₂( ~g ) . Choose the correct statement(s) about the above process :

Options

  1. AOH ⁻ ions react with N ₂ H ₄ at the anode to form N ₂( ~g ) and water, releasing 4 electrons to the anode.
  2. BAt the cathode, N ₂ H ₄ breaks to N ₂( ~g ) and nascent hydrogen released at the electrode reacts with oxygen
  3. CAt the cathode, molecular oxygen gets converted to OH ⁻ .
  4. DOxides of nitrogen are major by-products of the electrochemical process.

Correct answer

A. OH ⁻ ions react with N ₂ H ₄ at the anode to form N ₂( ~g ) and water, releasing 4 electrons to the anode.

Step-by-step solution

( Oxidation (Anode) -2 N₂H₄ + Reduction (Cathode) 0 O₂ 0 N₂ + H ₂ O ⁻² ) At anode: ( N ₂ H ₄+4 OH ⁻ N ₂+4 H ₂ O +4 e⁻ ) At cathode: ( O ₂+2 H ₂ O +4 e⁻ 4 OH ⁻ ) Complete reaction: ( N ₂ H ₄+ O ₂ N ₂+2 H ₂ O ) Statements (A) and (C) are correct.

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