Chemistry Question Bank

Sulphide ores of metals are usually concentrated by Froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching? (AIPMT 2007)

Gº vs T plot in the Ellingham’s diagram slopes downwards for the reaction. (RPMT 2006) (a) Mg+ O MgO -> (b) 2Ag+ O Ag O -> (c) C O CO -> (d) CO O CO ->

Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic? (RPMT 2006)

Consider the following reaction at 1000ºC. (AIPMT 2006) I. - Zn(s)+ O (g) ZnO(s);ΔG°=-360KJmol -> II. - C(gr)+ O (g) CO(g);ΔG°=-460KJmol -> Choose the correct statement at 1000ºC

Cassiterite is an ore of

Silver is obtained from Na [Ag(CN)2] by reaction with:

In the process of extraction of gold, Roasted gold ore + CN – + H2O -> [X] + HO – [X] + Zn -> [Y] + Au Identify the complexes [X] and [Y]

Which of the following ligands is used to form the complex from which silver is extracted?

The cyanide process is used for the extraction of

Which of the following is a sulphide ore?

Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH4). This Process X is called .......... and the metal contains impurities of Y …

In the extraction of Fe from Fe2O3, the reducing agent is

Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic?

Copper is extracted from sulphide ore using the method:

Which of the following minerals does not contain iron?

During the extraction of iron, slag produced is

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