The negative plates of a lead acid battery has

Solution (By Examveda Team)

The negative plates of a lead-acid battery are made of spongy lead (Pb).

This spongy form increases the surface area for chemical reactions and plays a vital role in the battery’s ability to discharge and recharge efficiently.

Why the other options are incorrect:

Option A: Lead peroxide (PbO₂)
This is incorrect because lead peroxide is found on the positive plate of a lead-acid battery, not the negative. It acts as the active material for the positive electrode during the chemical reactions.

Option C: Lead sulphate (PbSO₄)
This is incorrect because lead sulphate forms on both the positive and negative plates during discharge, but it is not the original material of either plate. It is a product of the chemical reaction between the plate materials and sulfuric acid.

Option D: Sulphuric acid (H₂SO₄)
This is incorrect because sulphuric acid is the electrolyte in a lead-acid battery, not a material used in the plates themselves. It facilitates the movement of ions and participates in the chemical reactions, but it is not part of the negative plate.

Therefore, the correct answer is Option B: Spongy lead (Pb).