Electrochemistry · JEE Advanced previous year questions

2024 2 questions

1. Q482024 · 26 May 2024 · Paper 1
   
   1. A.P-4, Q-3, R-2, S-5
   2. B.P-2, Q-4, R-3, S-1
   3. C.P-3, Q-4, R-2, S-5
   4. D.P-4, Q-3, R-2, S-1
   Show answer

   Answer: C

2. Q392024 · 26 May 2024 · Paper 2· One or more correct

   An aqueous solution of hydrazine (${\mathrm{N}}_2{\mathrm{H}}_4$) is electrochemically oxidized by ${\mathrm{O}}_2$, thereby releasing chemical energy in the form of electrical energy. One of the products generated from the electrochemical reaction is ${\mathrm{N}}_2(\mathrm{g})$. Choose the correct statement(s) about the above process

   1. A.$\mathrm{O}{\mathrm{H}}^{-}$ ions react with ${\mathrm{N}}_2{\mathrm{H}}_4$ at the anode to form ${\mathrm{N}}_2(\mathrm{g})$ and water, releasing 4 electrons to the anode.
   2. B.At the cathode, ${\mathrm{N}}_2{\mathrm{H}}_4$ breaks to ${\mathrm{N}}_2(\mathrm{g})$ and nascent hydrogen released at the electrode reacts with oxygen to form water.
   3. C.At the cathode, molecular oxygen gets converted to $\mathrm{O}{\mathrm{H}}^{-}$.
   4. D.Oxides of nitrogen are major by-products of the electrochemical process.
   Show answer

   Answer: A, C