Chemistry Question Bank

Extraction for zinc from zinc blende is achieved by

The electrometallurgical process (electrolysis of fused salts) is employed to extract

Of the following metals, the one which cannot be obtained by the electrolysis of the aqueous solution of its salt is

Which of the following minerals contains calcium as well as magnesium?

The mineral carnallite contains

Silver can be separated from lead by:

Copper and lead are mainly extracted by

Which of the following mixtures is called matte?

Blister copper is obtained in

In the extraction of iron, Fe2O3 is reduced by

Which of the following is also known as “Fools gold”?

In the equation, 4M+8CN– + 2H2O + O2-> 4 [M(CN)2]– + 4OH–, the metal M is

Ultrapure silicon, used to make semiconductors, is obtained by the

Impure nickel is purified by

Which method of purification is represented by the following equation? Ti+2I TiI Ti+2I K K -> ->

The van Arkel method for purification of metals involves the conversion of the metal into a

Which of the following metals is refined by the van Arkel process?

Certain metals can be obtained in the ultrapure state by heating with iodine and then decomposing the metal iodide at a much higher temperature. This method is known as

The metal which is extracted by electrolytic reduction is

The main function of roasting is

Which of the following changes take place during roasting?

Which one of the following reactions represents a calcination reaction?

Calcination of ores involves heating the ore below its fusion temperature

By which of the following processes is an oxide ore reduced to the free metal?

A flux is often added to remove impurities from an ore in a blast furnace. In the reaction CaO + SiO2-> CaSiO3 the slag and the flux are