Question

Shreya's father got a transfer from Lucknow to Goa. When Shreya started living in goa she observed that all her bangles made up of metals were getting a layer of brown coating. This layer of brown coating is due to a process called ___ .

Answer 1

Rusting is more in coastal areas because sodium chloride makes iron rust more quickly. For example, the iron objects by seashore, "where seawater has a high salt content, amounting to about 3.6% in the Atlantic and Pacific Oceans."The thin water film on iron surface contains dissolved sodium chloride from sea spray. As a result, a special "seawater rust" is formed which is actually very strongly corrosion inducing. Presence of soluble salts other than sodium chloride may also assist rusting.