General Princip...

Which of the following metals can be used for sharp casting?

The method of extraction of silver by cyano complex formation followed by metal displacement is called as:

Which of the following technique is used in the manufacture of aluminium from bauxite?

______ metal generally occurs in free state.

Name the metal which is commonly used as a reducing agent in metallurgical operations?

Zone refining is a method to obtain:

Zone refining is a technique used primarily for which one of the following process?

Which of the following is used in making planes?

An ore of tin containing FeCrO₄ is concentrated by:

Zn-Ag alloy formed in the upper layer of molten lead is skimmed off from the surface of the molten lead by perforated ladles. This alloy contains lead as impurity. This impurity of Pb is removed by:

From the Ellingham graphs on carbon, which of the following statements is false?

Ag can be obtained from purified Zn-Ag alloy by:

In the extraction of some metals from their ores, coke can be used as:

Keeping in mind the concepts of oxidation and reduction, identify the correct statement.

Which of these is not the step involved in extraction of an ore?

The process of leaching, alumina using sodium carbonate is called _________.

Select the correct statement.

In the cyanide process for extraction of gold and silver from ores, the cyanide solution acts as a:

Assertion:

Lead, tin and bismuth are purified by liquation method.

Reason:

Lead, tin and bismuth have low m.p. as compared to impurities.

The oil used in the froth floatation method for the purification of ore is _________.

During the process of electrorefining of \(\mathrm{Cu}\), some metals present as impurity settle as anode mud. These are:

Match column A (process) with column B (electrolyte).

Matrix is defined as:

Which one of the following is an oxidation-reduction reaction?

Ellingham diagram represents the change in:

Aluminium is extracted by:

The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as:

Gangue have:

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

In Hall's process, the ore is mixed with: