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NEET Questions / Chemistry / General Principles And Processes Of Isolation Of Elements
In the leaching of gold with cyanide, the role of oxygen is BEST described as:
Reducing agent, converting gold ions to metallic gold.
Complexing agent, directly forming a soluble gold complex.
Oxidizing agent, facilitating the formation of a soluble gold complex.
Catalyst, speeding up the dissolution process without being consumed.
The Ellingham diagram does NOT directly account for which of the following factors that can influence the feasibility of a reduction reaction?
Temperature
Partial pressure of gases involved
Kinetics of the reaction
Entropy change of the reaction
Zone refining is based on the principle that impurities are more soluble in the:
melt of the metal than in the solid state of the metal
solid state of the metal than in the melt of the metal
vapour phase of the metal than in the liquid state of the metal
solid state of the metal than in the vapour phase of the metal
During the extraction of zinc from its sulphide ore, the roasting process primarily aims to:
Convert zinc sulphide to zinc oxide and remove volatile impurities like arsenic and antimony.
Reduce zinc oxide to metallic zinc using carbon.
Concentrate the zinc sulphide ore by froth flotation.
Leach the zinc sulphide ore with sulphuric acid.
The process of zone refining is based on the principle that:
Impurities are more soluble in the melt than in the solid state of the metal.
Impurities are more volatile than the metal being refined.
Impurities react with the added reagents to form volatile compounds.
Impurities have higher melting points than the metal being refined.
The concentration method based on the difference in wettability of ore and gangue particles is:
Froth flotation
Magnetic separation
Leaching
Gravity separation
In which method is the ore dissolved selectively using a suitable reagent?
Leaching
Froth flotation
Magnetic separation
Gravity separation
The concentration method that relies on the difference in densities of the ore and gangue is:
Gravity separation
Froth flotation
Magnetic separation
Leaching
In the froth flotation process, the role of the depressant is to:
Prevent certain sulphide ores from being collected in the froth
Stabilize the froth
Increase the wettability of the ore
Increase the density of the gangue
Which of these is NOT a step in the process of hydraulic washing?
Roasting
Washing the ore with a stream of water
Using a sloping surface to separate based on density
Removing lighter gangue particles by water
