NEET Chemistry: Class 12, Chapter 3: Electrochemistry questions with solutions

Q1. Internal resistance of a battery cell increases with:

1. increase in concentration of electrolyte
2. increase in distance between two electrodes
3. increase in area of the plates inside the electrolyte
4. increase in size of the electrodes

Answer: increase in distance between two electrodes

Internal resistance increases when the electrodes are farther apart because ions must travel a longer path through the electrolyte, causing more opposition to current. The other options generally reduce resistance by improving conductivity or increasing effective contact area.