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The reaction Cr2O3+2AltoAl2O3+2Cr (tri...

The reaction
`Cr_2O_3+2AltoAl_2O_3+2Cr` `(triangleG^(ɵ)=-421kJ))`
Is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

A

Certain amount of activation energy is essential for thermodynamically feasible reactions also.

B

Due to high melting point of chromium oxide the reaction does not take place.

C

Overall value of `DeltaG` for the net reaction becomes positive.

D

Molecules of `Cr_(2)O_(3)` and Al are not oriented properly.

Text Solution

Verified by Experts

The correct Answer is:
A
The spontaneous reaction also requires a certain amount of activation energy therefore heating is required.
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Give reason : Reduction of Cr_(2) O_(3) with Al is thermodynamically feasible, yet it does no occur at room temperature.

(A) The reduction reaction, Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr, DeltaG^(0)=-421KJ is not possible at room temperature (R ) Certain amount of activation energy is essential for the reaction to make it thermodynamically feasible.

In the reaction: 2Al + Cr_(2) O_(3) rarr Al_(2) O_(3) + 2 Cr , 4.98 g of Al reacted with 20.0 g Cr_(2)O_(3) . How much grams of reactant ramains at the completion of the reaction?

In Cr_2O_7^(2-) all Cr-O bonds are equivalent.

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