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NEET Questions / Chemistry / General Principles And Processes Of Isolation Of Elements
Which of the following metals is commonly refined by electrolysis?
Copper
Lead
Tin
Mercury
The removal of impurities from blister copper by oxidation is known as:
Poling
Distillation
Liquation
Zone refining
Which refining method is employed for metals with a low melting point and high density difference between the metal and its impurities?
Liquation
Distillation
Electrolysis
Vapour phase refining
Which of the following statements is true regarding the Ellingham diagram?
It shows the temperature dependence of the standard Gibbs free energy change for the formation of metal oxides.
It shows the pressure dependence of the standard Gibbs free energy change for the formation of metal oxides.
It shows the concentration dependence of the standard Gibbs free energy change for the formation of metal oxides.
It shows the entropy change for the formation of metal oxides.
In an Ellingham diagram, a reaction with a negative slope indicates:
The reaction becomes more spontaneous at higher temperatures.
The reaction becomes less spontaneous at higher temperatures.
The reaction is independent of temperature.
The entropy change is zero.
Ellingham diagrams are particularly useful for understanding the:
Reduction of metal oxides.
Oxidation of metals.
Neutralization reactions.
Solubility of salts.
What does a line with a positive slope on an Ellingham diagram represent?
An increase in entropy
A decrease in entropy
An increase in enthalpy
A decrease in enthalpy
The Ellingham diagram plots the change in which thermodynamic quantity against temperature?
Gibbs Free Energy
Enthalpy
Entropy
Internal Energy
A sudden change in the slope of a line in an Ellingham diagram indicates:
A phase change in the metal or its oxide.
A change in the reaction mechanism.
A change in pressure.
A change in concentration.
Which of these metals is NOT typically extracted using electrolysis?
Aluminum
Sodium
Magnesium
Iron
