When a lead-acid battery is in fully charged condition, the color of its positive plate is

The correct answer is: A. dark grey

When a lead-acid battery is in a fully charged condition, the color of its positive plate is dark grey. This is because the lead sulfate on the plate has been converted to lead dioxide. Lead dioxide is a dark grey powder.

The other options are incorrect because:

• Option B: brown is the color of the positive plate when the battery
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