19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In the froth-floatation process, the sulphide ores are concentrated by mixing the ore with
In the froth-floatation process, the ore particles float because
Sulphide ores are generally concentrated by the
Concentration of ores is not done by the
Silicon is the main constituent of
The ore of calcium which contains phosphorus is
The metal which mainly occurs as oxide ore in nature is:
Among the following, the most abundant metal in the earth’s crust is
Which of the following statements is correct?
An element whose electronic configuration is 4s13d10. The possibility of element is
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 elements is present as the impurity to the maximum extent in the pig iron? (AIPMT 2011)
Cupellation process is used in the metallurgy of: (AIPMT 2011)
Which of the following diagram explain extraction of metal from metal oxide: (RPMT 2010)
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)
In the cryolite CaCl2 is added to: (AIPMT 2009)
The process of extracting Ti from TiCl4 in presence of Mg is called: (RPMT 2009)
In the extraction of silver, Ag2S is dissolved in: (AIPMT 2009)
Which metal has a greater tendency to form metal oxide? (RPMT 2008)
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true? (RPMT 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)
The magnetite ore is (AIPMT 2007)
Blister copper is: (AIPMT 2007)
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 ->