In electroplating iron, zinc gives a more efficient protective coating than tin because

Kingsley Thompson February 08, 2026

 In electroplating iron, zinc gives a more efficient protective coating than tin because

A. tin is heavier than zinc

B. tin is higher than iron in the activity series

C. zinc is higher than iron in the activity series

D. zinc is heavier than tin 

The correct answer is C. zinc is higher than iron in the activity series ✅

Explanation:

  • In electroplating/protective coating, a metal higher in the activity (reactivity) series will corrode first and protect the iron.

  • Zinc is more reactive than iron, so it undergoes corrosion instead of the iron. This is called sacrificial protection.

  • Even if the coating is scratched, zinc still protects the iron.

Tin, however, is less reactive than iron. If tin coating is damaged, the iron will rust faster.

Why others are incorrect:

  • A & D (weight) → Weight does not determine protection.

  • B → Tin is not higher than iron in the activity series.

👉 Final Answer: C. zinc is higher than iron in the activity series

PQN: 4

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Kingsley Thompson

Posted by: Kingsley Thompson

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