Question

The sculptures made of which amongst the following material will rust easily?

• A. Iron, Copper, Stainless steel
• B. Iron, Copper, Galvanised iron
• C. Iron, Copper, Silver
• D. Iron, Copper, Painted steel

Answer 1

The correct option is C Iron, Copper, Silver

Corrosion is the process of slowly eating up metals by gas and water vapours present in the atmosphere due to the formation of certain compounds like oxide, sulphides, carbonate, etc. For example: Corrosion of copper and silver

Iron articles, when exposed to air and moisture for a prolonged time, acquire a brown flaky coating called rust.

Rusting reduces the structural strength of iron and can be prevented by painting, galvanising, greasing and alloying. For example- Galvanised iron, painted steel

Alloying is a method to prevent rusting by mixing a metal with one or more metals or non-metals. An alloy is a mixture of one or more metals or non-metals. Stainless steel is an example of an alloy made by mixing iron with some other metals and non-metals.

Chemical reactions

Corrosion of copper

Rusting of iron

_{Corrosion of silver$4\mathrm{Ag}+2H_{2}S+O_2\to 2{\mathrm{Ag}}_{2}S+2H_{2}O\mathrm{Silver}\mathrm{Hydrogen}\mathrm{sulphide}\mathrm{Silver}\mathrm{sulphide}$Therefore option b is the correct answer}