Why is zinc better than tin if we want to protect a piece of iron from rusting by electroplating?
Tin is toxic.
Zinc is cheaper than tin.
Rusting is prevented even when the zinc layer is broken.
None of these
A
Rusting is prevented even when the zinc layer is broken.
B
Zinc is cheaper than tin.
C
None of these
D
Tin is toxic.
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Solution
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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.
Hence, option A is correct.
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