Why is zinc better than tin if we want to protect a piece of iron from rusting by electroplating?
A
Zinc is cheaper than tin.
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B
Tin is toxic.
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C
Rusting is prevented even when the zinc layer is broken.
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D
None of these
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Solution
The correct option is B Zinc is cheaper than tin. When zinc coating is applied over iron, it undergoes sacrificial anode, an electrochemical process that acts as a physical barrier and protects the iron from corrosion.
But tin has susceptibility to abrasion and mechanical damage easily. Also, zinc is cheaper than tin.