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Physical Properties of Metals

Pure gold sho...

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Pure gold should be alloyed with how many parts of silver (or copper) in order to make 18 carat gold? (a)4 (b)6 (c)2 (d)8

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Q. How many parts of pure gold are usually alloyed with 2 parts of either copper or silver for making ornaments in India?

24

carat gold is known as pure gold.

22

carat gold is prepared by mixing

22

parts of pure gold with

2

parts of either silver or copper. Now - a - days,

22

carat hallmarked jewellery is marked by number

(916)

which indicates its purity. Which number should be marked on

19

carat jewellery. Write the number of correct alternative in the answer sheet.

Assertion:- An alloy of gold with copper or silver is used to make ornaments.

Reason:- Pure gold is soft due to which it cannot be not used to make ornaments.

Q. Given that 24 carat gold is pure gold 18 carat gold is 314 gold and 20 carat gold is 5/6 gold. Find the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold.

24

carat gold is pure gold,

18

3 / 4

20

5 / 6

gold. Find the ratio of the pure gold in

18

carat gold to the pure gold in

20

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