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Why aluminium can be used as a reducing ...

Why aluminium can be used as a reducing agent for the reduction of chronic oxide?

Text Solution

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Ellingham diagram is used to predict thermodynamic feasibility of reduction of oxides of one metal by another metal.Any metal can reduce the oxides of other metals that ar located above it in the diagram .for example ,in the Ellingham diagram ,for the formation of chromium oxide lies above that of the aluminium,meaning that `Al_(2)O_(3)` is more stable than`Cr_(2)O_(3)`.Hence aluminium can be used as a reducing agent for the reduction of chromic oxide.However ,it cannot be used to redice the oxides of magnesium and calcium which occupy lower position than aluminium oxide.
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Knowledge Check

  • Assertion (A): Aluminium can be used as a reducing agent for the reduction of chromic oxide. Reason(R ):In the Elligham diagram ,formation of chromium oxide lies diagram,formation of chromium oxide lies above that of the aluminium,therefore Al_(2)O_(3) is more stable than Cr_(2)O_(3)

    A
    A and R are correct mR explain A
    B
    A and R are correct,R does not explains A
    C
    A is correct but R is wrong
    D
    A is wrong but R is correct

  • Assertion : Aluminium metal is used as a reducing agent for the extraction of metals. Reason : Aluminium has great affinity for oxygen.

    A
    Both (A) and (R ) are true and (R ) is the correct explanation of (A).
    B
    Both (A) and (R ) are true and (R ) is not the correct explanation of (A).
    C
    (A) true but (R ) false.
    D
    Both (A) and (R ) are false.

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