Question

When a lead-acid battery is in fully charged condition, the colour of its positive plate is _____.
1. dark grey
2. Silver
3. Pure white
4. dark brown

Answer 1

Correct Answer - Option 4 : dark brown

Lead-acid battery:

Positive plate: PbO2, deposited on a grid frame of antimony lead alloy. When battery is fully charged condition, the positive plate is in dark brown in colour.

Negative plate: Pb, deposited on a grid frame. When the battery is fully charged condition, the negative plate is grey in colour. When the battery has fully discharged the colour of negative plate is pure white.