The value of - f G 0 for Cr 2 O 3 is 540 kJ mol -1 and that of Al 2 O 3 is -827 kJ mol -1- Is the reduction of Cr 2 O 3 by Al is feasible reaction-A- The data is incomleteB- The reaction is feasibleC- The reaction is not feasibleD- The reaction may or may not be feasible

The correct option is B The reaction is feasible nbsp;The free energy of formation of alumina is more negative than Cr_2O_3 . According to thermodynamics if ...

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Electrochemical Cells, Galvanic Cells

The value of ...

Question

The value of $Δ_{f} G^{0}$ for $C r_{2} O_{3}$ is $540 {kJ mol}^{- 1}$ and that of $A l_{2} O_{3}$ is $- 827 {kJ mol}^{- 1}$ . Is the reduction of $C r_{2} O_{3}$ by $A l$ is feasible reaction?

The data is incomlete

No worries! We‘ve got your back. Try BYJU‘S free classes today!

The reaction is feasible

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

The reaction is not feasible

No worries! We‘ve got your back. Try BYJU‘S free classes today!

The reaction may or may not be feasible

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B The reaction is feasible
The free energy of formation of alumina is more negative than $C r_{2} O_{3}$ . According to thermodynamics if $Δ G^{0}$ , is more negative then reaction is more fealible.

Free energy of formation of $A l_{2} O_{3} = - 827 {kJ mol}^{- 1}$
$\frac{4}{3} A l + O_{2} \to \frac{2}{3} A l_{2} O_{3} Δ G_{f} = - 827 {kJ mol}^{- 1}$

Free energy of formation of $C r_{2} O_{3} = - 540 {kJ mol}^{- 1}$
So, $\frac{2}{3} C r_{2} O_{3} \to \frac{4}{3} C r + O_{2} Δ G_{f} = 540 {kJ mol}^{- 1}$

Hence the free energy of reaction between $A l$ and $C r_{2} O_{3}$
$2 A l + C r_{2} O_{3} \to A l_{2} O_{3} + 2 C r$
$Δ G^{0} = - 827 + 540 = - 287 kJ mol$
Hence the reaction is feasible.

Suggest Corrections

Similar questions

Q. The value of

Δ_{f} G^{0}

for

C r_{2} O_{3}

540 {kJ mol}^{- 1}

and that of

A l_{2} O_{3}

- 827 {kJ mol}^{- 1}

. Is the reduction of

C r_{2} O_{3}

A l

is feasible reaction?

Q. The value of

Δ_{r} G^{\circ}

for

C r_{2} O_{3}

- 540 {kJ mol}^{- 1}

and that of

A l_{2} O_{3}

- 827 {kJ mol}^{- 1}

. Is the reduction of

C r_{2} O_{3}

A l

is feasible reaction?

Q. The value of

Δ_{f} G^{0}

for formation of

C r_{2} O_{3}

- 540 k J m o l^{- 1}

and that of

A l_{2} O_{3}

- 827 k J m o l^{- 1}

. Is the reduction of

C r_{2} O_{3}

possible with

A l

The value of for formation of Cr₂O₃is − 540 kJmol⁻¹ and that of Al₂ O₃ is − 827 kJmol⁻¹. Is the reduction of Cr₂O₃ possible with Al?

Q. Value of

△ G^{\circ}

for formation of

C r_{2} O_{3}

and

A l_{2} O_{3}

are

- 540 k J m o l^{- 1}

and

- 827 k J m o l^{- 1}

respectively. Is reduction possible of

C r_{2} O_{3}

A l

Join BYJU'S Learning Program

The value of ΔfG0 for Cr2O3 is 540 kJ mol−1 and that of Al2O3 is −827 kJ mol−1. Is the reduction of Cr2O3 by Al is feasible reaction?

The value of $Δ_{f} G^{0}$ for $C r_{2} O_{3}$ is $540 {kJ mol}^{- 1}$ and that of $A l_{2} O_{3}$ is $- 827 {kJ mol}^{- 1}$ . Is the reduction of $C r_{2} O_{3}$ by $A l$ is feasible reaction?