Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?

Open in App

Solution

Magnesium is costly and not easily available in free form. So, it is not used for the reduction of alumina in the metallurgy.

Suggest Corrections

Similar questions

Q. Assertion :Magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Reason: MgO curve lies above

A l_{2} O_{3}

curve in Ellingharn diagram.

Q. Study the Ellingham diagram for the formation of some oxides and answer the following question.
At the point of intersection of

A l_{2} O_{3}

and

M g O

curves (A),

△ G^{0}

becomes zero for the reaction,

\frac{2}{3} A l_{2} O_{3} + 2 M g \to + \frac{4}{3} A l

Below this point, magnesium can reduce alumina. Although thermodynamically feasible, Al is not used for reduction of

M g O

because:

The auto-reduction process is not used in the metallurgy of

Q. The auto reduction process is not used in the metallurgy of:

(e) Give reasons why:
(i) Hot water has no action on aluminium.
(ii) Concentrated nitric acid makes iron passive.
(iii) Cryolite and fluorspar are added to alumina, in the metallurgy of aluminium.
(iv) Metals are good reducing agents.
(v) Carbon tetrachloride does not dissolve in water.

Join BYJU'S Learning Program