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(a) What is the percentage of gold in 18 carat gold? Name any two metals that are used to make 22 carat gold.
(b) Like gold, pure iron is also comparatively soft and also undergoes rusting. Name the substance that is mixed with iron.
(i) to make it hard.
(ii) to change it to stainless steel to prevent rusting.
Answer:
(a) Percentage of gold in 18 carat gold = No. of parts of gold/Total no of parts x 100
= 18/24 x 100
= ¾ x 100
= 75%
Metals generally mixed with gold are: Silver, Copper
(b 1)
(i) Carbon is mixed with Iron to make it hard . This is known as steel .
(ii) Nickel and Chromium are used to prevent rusting , which makes the mixture into stainless steel .
