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.

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.

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

3 elements x , Y and Z form a Dobereiner triad . Their atomic weights are in the ratio 5 : 11 : 17 . If the sum of the atomic weights of extreme elements is 176 , then find the atomic weights of X , Y and z .

Two elements X and Y have atomic weight of 14 and 16 . They form a series of compounds , A , B , C with fixed mass of X , Y is present in the ratio 1 :2 : 3 : 4 : 5 . If the compound A has 28 parts by weight of X and 16 parts by weight of Y , then the compound C will have 28 parts by weight of X and

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) )

An iron pillar consists of a cylindrical portion of 2.8 m. height and 20 cm. in diameter and a cone of 42 cm. height surmounting it. Find the weight of the pillar if 1 cm^(3) of iron weighs 7.5 g.

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?