19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Heating pyrites to remove sulphur is called
The zone-refining process for purification of metals is based on
In electrorefining of metals, the anode is made of
The distillation process (under reduced pressure) is used for the purification of
Certain metals can be obtained in the ultrapure state by heating with iodine and then decomposing the metal iodide at a much higher temperature. This method is known as
Of the following metals, the one which cannot be obtained by the electrolysis of the aqueous solution of its salt is
Aluminium is not present in which of the following mineral?
The ore having two different metal atoms is (AIPMT 2006)
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 elements is present as the impurity to the maximum extent in the pig iron? (AIPMT 2011)
Which of the following pairs of metals is purified by van Arkel method? (AIPMT 2011)
The process of converting hydrated alumina into anhydrous alumina is called (AIPMT 2013)
Identify the incorrect statement. (NEET Odisha 2015)
Identify the incorrect statement. (Odisha NEET 2019)
Which of the following has maximum iron content? (AIIMS 2019)
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature? (NEET 2021)
The maximum temperature that can be achieved in blast furnace is: (NEET 2021)
The ore of calcium which contains phosphorus is
Wolframite (FeWO₄), present as an impurity in cassiterite (SnO₂), can be removed by the process of
Which of the following benefaction processes is used for the mineral, Al₂O₃.2H₂O?
Which one of the following is not a basic flux?
A flux is often added to remove impurities from an ore in a blast furnace. In the reaction CaO + SiO₂ → CaSiO₃ the slag and the flux are
By which of the following processes is an oxide ore reduced to the free metal?
Which one of the following reactions represents a calcination reaction?