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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
The ore having two different metal atoms is (AIPMT 2006)
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
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?
Which of the following minerals does not contain iron?
During the extraction of iron, slag produced is
The metal which is extracted by electrolytic reduction is
The main function of roasting is
Which of the following changes take place during roasting?
Roasting or ores is done