A goldsmith mixes gold and copper in the ratio 7:2 to prepare an ornament. If the ornament weighs 45gms, find the weight of gold and copper in it.

A Gold smith mixes gold and copper in the ratio of 5:2 to prepare an ornament. If the ornament weights 105 gms. Find the weight of gold and copper in it.

Copper is prepared as alloying element in ornamental gold. Why?

A copper wire and an aluminium wire have lengths in the ratio 5:2 diameters in the ratio 4:3 and forces applied in the ratio 4:5. Find the ratio of increase in length of the copper wire to that aluminium wier. (Let Y_(Cu)=1.1xx10^(11)Nm^(-2),Y_(Al)=0.7xx10^(11)Nm^(-2) )

In every gram of gold, a goldsmith mixes 0.25 grams of sliver and 0.05 grams of copper. What is the percentage of gold, silver and copper in every gram of gold?

In a periodic table , where do you find the Gold , Silver and copper ?

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?