Food cans are coated with tin and not with zinc because
- AZinc is costlier than tin
- BZinc has a higher melting point than tin
- CZinc is more reactive than tin
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (c) Zinc is more reactive than tin
Explanation
Food cans are coated with tin because zinc is more reactive than tin. Acids in food would attack a zinc coating and make poisonous zinc salts, while tin stays unaffected.
Zinc does not have a higher melting point (zinc melts at about 420 °C, tin at about 232 °C), and it is cheaper than tin, not costlier.