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

330 350K Ni 4CO Ni CO → 450 470K Ni CO Ni 4CO → The above reactions are of the purification of Ni by

The major role of fluorspar (CaF₂) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na₃AlF₆) is

Aluminium is extracted by the electrolysis of

In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false?

Cryolite is:

Electrolytic reduction of alumina to aluminium by the Hall-Heroult process is carried out

The major role of fluorspar (CaF₂) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na₃AlF₆) is

During the electrolytic reduction of aluminium, the carbon anodes are replaced from time to time because

Which of the following is a fluoride ore?

In extractive metallurgy of zinc, partial fusion of ZnO with coke is called

In extractive metallurgy of zinc, partial fusion of ZnO with coke is called

Extraction for zinc from zinc blende is achieved by

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

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

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?