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Home » (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) 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.
CBSE | Chemistry | Class 10 | Exercise 1 | Lakhmir Singh | Metals and Non Metals
(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.

Solution:

(a) When the paint is put to a surface, it keeps the object from rusting by preventing air and moisture from coming into touch with it.

(b) Copper alloys such as brass and bronze have lower electrical conductivity than pure copper.

(c) 22-carat gold is made by alloying 22 parts pure gold with 2 parts silver or copper to make jewellery. To make it tougher, silver and copper are frequently alloyed with gold.

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