Chemistry Question Bank

Consider the following metallurgical processes: (I) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. 430C) and finally decomposition at 1500-2000C to get the pure metal (II) Heating th…

Which of the following pair of ores cannot be converted into corresponding metals by pyrometallurgy?

Formation of metallic copper from the sulphide ore in the commercial metallurgical process involves. (a) Cu S+ O Cu O+SO ; Cu O+C 2Cu+CO -> -> (b) Cu S O Cu O SO ; 2Cu O Cu S 6Cu SO -> -> (c) Cu S 2O CuSO ; CuSO C…

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly

Select correct statement:

Boron can be obtained by various methods but not by:

Among the following statements, the incorrect one is:

Calcination of ores involves heating the ore below its fusion temperature

Copper and lead are mainly extracted by

An element whose electronic configuration is 4s13d10. The possibility of element is

Which of the following statements is correct?

The impurities present in a mineral are called

Among the following, the most abundant metal in the earth’s crust is

The metal which mainly occurs as oxide ore in nature is:

The ore of calcium which contains phosphorus is

Silicon is the main constituent of

Concentration of ores is not done by the

Sulphide ores are generally concentrated by the

In the froth-floatation process, the ore particles float because

In the froth-floatation process, the sulphide ores are concentrated by mixing the ore with

Wolframite (FeWO4), present as an impurity in cassiterite (SnO2), can be removed by the process of

Chemical leaching is useful in the concentration of:

Which of the following benefaction processes is used for the mineral, Al2O3.2H2O?

In the froth floatation process for benefaction of the ores, the ore particles float because

Which one of the following ores is best concentrated by froth floatation method?