Name the alloy which is formed from copper and tin.

An alloy A contains two elements, copper and tin in the ratio of 2 : 3, whereas an alloy B contains the same elements in the ratio of 3 : 4. If 20 kg of alloy A, 28 kg of alloy B and some more pure copper are mixed to form a third alloy C which now contains copper and tin in the ratio of 6 , 7, then what is the quantity of pure copper mixed in the alloy C ?

Zinc is extracted from zinc blende. The zinc blende is roasted. The solid product is mixed with coke in a blast furnace from which zinc vapours emerge. What is the name of the alloy formed by copper and zinc?

An alloy of copper and zinc.

An alloy of copper and zinc.

Name the alloy of copper which is used in making utensils and vessels.

An alloy which does not contain copper is :

An alloy which does not contain copper is