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(a) How does the painting of an iron object prevent its rusting?(b) How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
(c) What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.
(a) When the paint is applied on a surface it prevents air and moisture to come in contact with the object and prevents rusting.
(b) The electrical conductivity of copper alloys like brass and bronze is less than that of pure copper.
(c) 22-carat gold is 22 part of pure gold is alloyed with 2 parts of either silver or copper for making ornaments. Silver and copper are usually alloyed with gold to make it harder
Updated on: 10-Oct-2022
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