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NEET UG CHEMISTRY MCQ: GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

1 Medium

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Analyzing +4 | -1

For the formation of

{Cr}_2 {O}_3

and

{Al}_2 {O}_3

, values of

\Delta_f G

are

540\, \mathrm{k\,J\,mol}^{-1}

and

-827 \,\mathrm{kJ\,mol}^{-1}

respectively. What will be the reaction of

{Cr}_2 {O}_3

by

{Al}

?

View answer and explanation

Correct option: A

Reduction of

{Cr}_2 {O}_3

, by

{Al}

will take place

Option A is correct because the negative difference in Gibbs free energy indicates that aluminium can reduce chromium(III) oxide.

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