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. It is due to which of the following?

Rusting

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Carbon coating

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Decomposition

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Cannot be determined

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Solution

The correct option is A
Rusting

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.

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