Electrochemistry — Chemistry STD 12 Science — Question

Zink is better than tin in protecting iron from corrosion because zink has more affinity to oxygen than tin. When is coated on iron layer then it reacts with oxygen if air to form a protective layer of zink oxide on iron which prevent the further reaction of iron with oxygen, and thus preventing the process of rusting. But in the case of tin, it(tin) does not react with oxygen thus it is less effective in preventing rusting.