The most convenient method to protect the bottom of the ship made of iron is:

1. Coating it with Red lead oxide.
2. White tin plating.
3. Connect it with the Mg block.
4. Connect it with the Pb block.

Subtopic:  Preparations, Properties & Uses of S Block Elements |
AIPMT - 2001
Please attempt this question first.
Hints
Please attempt this question first.