For lead storage battery pick the correct statements: A. During charging, PbSO4 on anode is converted into PbO2 B.…

Strategy: Evaluate statements regarding the lead storage battery, focusing on the chemistry of charging and discharging as well as its physical components.

Statements Evaluation:

• (A) Charging Anode: During charging, the original anode ($\ce{Pb}$) becomes the cathode, and the original cathode ($\ce{PbO2}$) becomes the anode (oxidation occurs). So, $\ce{PbSO4}$ on the "charging anode" is converted back to $\ce{PbO2}$. ✓ (Assuming formal definition of anode as where oxidation happens).
• (B) Charging Cathode: $\ce{PbSO4}$ is redu\ced back to $\ce{Pb}$. Statement B is typically viewed as True in specific con\texts. ✓
• (C) Grid Component: $\ce{PbO2}$ is the cathode during discharge, not the anode ($\ce{Pb}$ is the anode). ✗
• (D) Electrolyte: 38% $\ce{H2SO4}$ is the standard concentration for a charged battery. ✓

Correct statements: B, D.

$\boxed{\text{Answer: (d) B, D only}}$