Chemistry Question Bank

Aluminium is extracted by the electrolysis of

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

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

The ore having two different metal atoms is (AIPMT 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

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

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 ->

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)

Blister copper is: (AIPMT 2007)

The magnetite ore is (AIPMT 2007)

Among the metals Cr, Fe, Mn, Ti, Ba and Mg, the one that cannot be obtained by reduction of metal oxide by aluminium is (RPMT 2007)

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true? (RPMT 2007)

Which metal has a greater tendency to form metal oxide? (RPMT 2008)

In the extraction of silver, Ag2S is dissolved in: (AIPMT 2009)

The process of extracting Ti from TiCl4 in presence of Mg is called: (RPMT 2009)

In the cryolite CaCl2 is added to: (AIPMT 2009)

The minimum voltage required to electrolyse alumina in the Hall-Heroult process is (Given, o f G Al O 1520kJ mol ; o f G CO 394kJmol ) (AIIMS 2009)

Which of the following diagram explain extraction of metal from metal oxide: (RPMT 2010)

Cupellation process is used in the metallurgy of: (AIPMT 2011)

Which of the following elements is present as the impurity to the maximum extent in the pig iron? (AIPMT 2011)

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag. (AIPMT 2011)

Which of the following pairs of metals is purified by van Arkel method? (AIPMT 2011)

The correct order of the abundance of the elements in earth’s crust is (AIMPT 2011)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with? (AIPMT 2012)

Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of (AIPMT 2012)