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Multiple Bond Formation

Carbon can no...

Question

Carbon can not be used i the reduction of ${A l}_{2} O_{3}$ because:

A

its is expensive.

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B

the enthalpy of formation of is

{C O}_{2}

more than that of

{A l}_{2} O_{3}

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C

pure carbon is not easily available .

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D

the enthalpy of formation of

{A l}_{2} O_{3}

is too high

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Solution

The correct option is D the enthalpy of formation of ${A l}_{2} O_{3}$ is too high

Very high temperatures around 2100 degree celcius is required for the carbothermic reduction.
Aluminium Oxide is a very stable oxide and lies below the the oxidation line of carbon in Ellingham Diagram hence $A l_{2} O_{3}$ cannot be reduced by carbon as it is energetically not favourable.
Hence option D is correct answer.

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Similar questions

Q. The standard enthalpies of formation of

A l_{2} O_{3}

C a O

- 1675 k J m o l^{- 1}

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

respectively. For the reaction

3 C a O + 2 A l \to 3 C a + A l_{2} O_{3}

the standard reaction enthalpy,

Δ_{r} H^{0} =

________kJ. (Round off to the Nearest Integer)

Q. The standard enthalpies of formation of

A l_{2} O_{3}

C a O

- 1675 k J m o l^{- 1}

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

respectively.
For the reaction,

3 C a O + 2 A l \to 3 C a + A l_{2} O_{3}

the standard reaction enthalpy,

Δ_{r} H^{0}

=______kJ (Rounded off to the Nearest Integer).

Q. When compared to

Δ G^{o}

for the formation of

{A l}_{2} O_{3}

Δ G^{o}

for the formation of

{C r}_{2} O_{3}

Q. The Gibbs energy for the decomposition of

{A l}_{2} O_{3}

500^{o} C

\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 96 k J

The voltage needed for the electrolytic reduction of aluminium oxide (

{A l}_{2} O_{3}

500^{o} C

Q. The Gibbs' energy for the decomposition of

{A l}_{2} O_{3}

500^{o} C

\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 960 k J {m o l}^{- 1}

The potential difference needed for the electrolytic reduction of aluminium oxide

({A l}_{2} O_{3})

500^{o} C

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