Metals are extracted from their ores by ...

Metals are extracted from their ores by a wide variety of techniques. The most common ores are oxides. Most metals are obtained by direct treatment of theirs ores with chemical agents, but the extraction of certain others require electrolysis. An example of the former type of process is the extraction of iron from its oxide, described by the following equation :
`Fe_(2) O_(3) + 3C rarr 2Fe + 3CO`
The relative ease of extraction of a metal from its oxide can be estimated using the Ellingham diagram, as shown in the figure.
The diagram plots the free energies of formation of various oxides per mole of consumed oxygen as a function of absolute temperature.

All of the following reagents could be used to extract lead from its oxide except

Molecular fluorine

Molecular boron

Molecular Nitrogen

Elemental carbon

Verified by Experts

The correct Answer is:

ORES AND METALLURGY
FIITJEE|Exercise MATRIX-MATCH THE FOLLOWING QUESTIONS|3 Videos
ORES AND METALLURGY
FIITJEE|Exercise MATCHING LIST TYPE QUESTIONS|3 Videos
ORES AND METALLURGY
FIITJEE|Exercise COMPREHENSION - II|2 Videos
NUCLEIC ACID AND VITAMIN
FIITJEE|Exercise ASSIGNMENT PROBLEMS (OBJECTIVE)|15 Videos
PERIODIC PROTERTIES OF ELEMENTS
FIITJEE|Exercise COMPREHENSION|13 Videos

Metals are extracted from their ores by a wide variety of techniques. The most common ores are oxides. Most metals are obtained by direct treatment of theirs ores with chemical agents, but the extraction of certain others require electrolysis. An example of the former type of process is the extraction of iron from its oxide, described by the following equation : Fe_(2) O_(3) + 3C rarr 2Fe + 3CO The relative ease of extraction of a metal from its oxide can be estimated using the Ellingham diagram, as shown in the figure. The diagram plots the free energies of formation of various oxides per mole of consumed oxygen as a function of absolute temperature. Which of the following best explains why the free energy of formation of Fe_(2)O_(3) becomes less negative as the temperature is increased.

The free energy of formation is independent of the absolute temperature.

Entropy drops as a result of the consumption of oxygen.

At low temperature, the free energy of formation becomes less dependent on the enthalpy of formation.

As entropy increases, the free energy of formation increases.

is directily proportional to the temperature

is inversely proportional to the temperature

is independent of the temperature

requires cooling of the CO

an oxidation process

a reduction process

a hydration process

a neutratlisaiton process