Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

(i) Gallium

(ii) Aluminium

(iii) Zinc

(iv) Silver

 

Answer

In order to prevent rusting of iron, it is coated with a layer of Zinc and this process is known as galvanisation .

If you look at the reactivity series, you will notice that zinc is a metal that is only slightly more reactive than Fe , unlike other metals. 

 This makes Zinc act as the protective layer which corrodes faster than iron, but not so fast that it corrodes away, and cannot protect Iron for a longer period of time.

reactivity-series-of-metals.jpg

So, the correct answer is (c) Zinc

  1. Class 10
  2. Chapter 3 Class 10 - Metals and Non-Metals (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo