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NEET Questions / Chemistry / Some Basic Concepts in Chemistry / Concentration Methods
Which of the following methods is NOT typically used for concentrating a dilute ore?
Froth flotation
Magnetic separation
Gravity separation
Distillation
In the leaching of alumina from bauxite, the concentration of the ore is achieved by:
Selective dissolution of alumina
Froth flotation
Magnetic separation
Electrolysis
Which method is employed for concentrating sulfide ores?
Froth flotation
Magnetic separation
Leaching
Gravity separation
Chromite ore is concentrated by:
Magnetic separation
Froth flotation
Leaching
Gravity separation
The process of removing gangue from ore is known as:
Concentration
Refining
Smelting
Roasting
Which of the following is used as a depressant in the froth flotation process for separating ZnS and PbS?
NaCN
Pine oil
Water
Xanthates
Which of the following is NOT a method for expressing the concentration of a solution?
Molarity
Molality
Mass percentage
Density
If 20 g of solute is dissolved in 80 g of solvent, what is the mass percentage of the solute?
20%
80%
25%
40%
Molality is defined as the number of moles of solute per:
Liter of solution
Kilogram of solvent
Kilogram of solution
Liter of solvent
Which concentration term is independent of temperature?
Molarity
Molality
Normality
Formality