CBSE · Class 12 · Chemistry · ElectrochemistryWhich gas is liberated at the cathode during the electrolysis of aqueous NaCl solution?
Step-by-Step Solution
The correct option is Hydrogen ($H_2$). During the electrolysis of aqueous NaCl, reduction of water takes place at the cathode rather than reduction of $Na^+$ ions because the reduction potential of water is higher than that of $Na^+$ ions. This leads to the evolution of hydrogen gas at the cathode.
Detailed Options Breakdown
Option : Chlorine ($Cl_2$)
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Electrochemistry.
Option 1: Oxygen ($O_2$)
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Electrochemistry.
Option 2: Hydrogen ($H_2$) (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Sodium ($Na$)
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Electrochemistry.
💡 Study Guide: This question tests core syllabus concepts from Electrochemistry. For formulas, key summaries, and mock exam reference guides, read the full Electrochemistry Revision Notes.