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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

Assertion (A) : Reduction of

{Cr}_2 {O}_3

with aluminium is possible.

Reason (R): The value of

\Delta G^0

for the formation of

{Cr}_2{O}_3

-540 \, \mathrm{kJ \, mol}^{-1}

and that of

{Al}_2 {O}_3

-827 \mathrm{~kJ} \mathrm{~mol}^{-1}.

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A is correct because the negative Gibbs free energy change for the formation of Al2O3 is more negative than that of Cr2O3, making the reduction of Cr2O3 with aluminum thermodynamically feasible.

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