Food cans are coated with tin and not with zinc because
(a) Zinc is costlier than tin.
(b) Zinc has a higher melting point than tin.
(c) Zinc is more reactive than tin.
(d) Zinc is less reactive than tin.
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Food cans are coated with tin and not with zinc because:
Zinc is more reactive than tin. Zinc has a higher tendency to react with substances, including food acids, which can lead to corrosion and spoilage of the food. Tin, on the other hand, is less reactive and provides a protective barrier against corrosion, ensuring the food remains safe and uncontaminated.
Zinc has a higher melting point than tin. The coating material used for food cans needs to have a lower melting point than the metal of the can itself. This is because the coating needs to be applied and bonded to the can at a lower temperature without affecting the integrity of the can. Tin has a lower melting point compared to zinc, making it more suitable for this purpose.
Therefore, the correct answer is (c) Zinc is more reactive than tin.
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