19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
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]
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
The distillation process (under reduced pressure) is used for the purification of
The anode mud in the electrolytic refining of silver contains: