Give reasons:
Gold is mixed with copper and nickel.
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Gold is the most malleable metal and is very soft. To make it harder and cheaper gold is mixed with copper and nickel.
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Graphite is used in the leads of pencils.
Impure diamond is used to cut glass.
Tungsten is used in electric bulbs.
Name the metals present in the following alloys:
(a) Brass
(b) Bronze
(c) Duralumin
(d) Stainless steel