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JEE Main 20205 SeptemberMorning Shift
Exam
JEE Main
Year
2020
Date
5 September
Shift
Morning Shift
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Main 2020 · 5 September · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

An Ellingham diagram provides information about:

An Ellingham diagram provides information about:

Options

  1. Athe conditions of pHpH and potential under which a species is thermodynamically stable.
  2. Bthe temperature dependence of the standard Gibbs energies of formation of some metal oxides.
  3. Cthe pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.
  4. Dthe kinetics of the reduction process.

Correct answer

B. the temperature dependence of the standard Gibbs energies of formation of some metal oxides.

Step-by-step solution

Ellingham diagram is graph of ΔG°\Delta G ° vs TT of any metal/element oxide. since

ΔG°=ΔH°−TΔS°\Delta G ° = \Delta H ° - T \Delta S °

for most metal oxide formation metal (s) + oxygen (g) →\tometal oxide (s)

\DeltaH°=−ve\DeltaH ° = - ve

ΔS°=−ve\Delta S ° = - ve

so graph will be a straight line with - ve y-intracept & + ve slope.

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