19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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)
Cupellation process is used in the metallurgy of: (AIPMT 2011)
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?
Aluminium is not present in which of the following mineral?
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
Of the following metals, the one which cannot be obtained by the electrolysis of the aqueous solution of its salt is
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?
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 …