19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Among the following, the most abundant metal in the earth’s crust is
The metal which mainly occurs as oxide ore in nature is:
The ore of calcium which contains phosphorus is
Silicon is the main constituent of
Concentration of ores is not done by the
Sulphide ores are generally concentrated by the
In the froth-floatation process, the ore particles float because
In the froth-floatation process, the sulphide ores are concentrated by mixing the ore with
Wolframite (FeWO4), present as an impurity in cassiterite (SnO2), can be removed by the process of
Chemical leaching is useful in the concentration of:
Which of the following benefaction processes is used for the mineral, Al2O3.2H2O?
In the froth floatation process for benefaction of the ores, the ore particles float because
Which one of the following ores is best concentrated by froth floatation method?
Flux is used to remove:
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?
Calcination of ores involves heating the ore below its fusion temperature
Which one of the following reactions represents a calcination reaction?
Roasting or ores is done
Which of the following changes take place during roasting?
The main function of roasting is
The metal which is extracted by electrolytic reduction is
Which of the following metals is obtained by electrolytic reduction process:
Heating with carbon in absence of air is known as :