NEET
- Exam
- NEET
- Subject
- Chemistry
- Chapter
- Hydrogen
NEET · Chemistry · Hydrogen
What reactions occur at the anode and cathode during the...
What reactions occur at the anode and cathode during the electrolysis of brine solution?
Options
- AAt anode: 2H2O(l) → 2H2(g) + O2(g); At cathode: 2Cl–(aq) → Cl2(g) + 2e–
- BAt anode: 2Cl–(aq) → Cl2(g) + 2e–; At cathode: 2H2O(l) → 2H2(g) + 2OH–(aq)
- CAt anode: 2H2O(l) → 2H2(g) + 2OH–(aq); At cathode: 2Cl–(aq) → Cl2(g) + 2e–
- DAt anode: 2Na+(aq) + 2OH–(aq) → 2NaOH(l); At cathode: 2H2O(l) → 2H2(g) + O2(g)
Correct answer
B. At anode: 2Cl–(aq) → Cl2(g) + 2e–; At cathode: 2H2O(l) → 2H2(g) + 2OH–(aq)
Step-by-step solution
At the anode, 2Cl– ions lose electrons and form chlorine gas (Cl2), while at the cathode, 2H2O molecules gain electrons and form hydrogen gas (H2) and hydroxide ions (OH–).