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When compared to DeltaG^(@) for the form...

When compared to `DeltaG^(@)` for the formation of `Al_(2)O_(3), DeltaG^(@)` for the formation of `Cr_(2)O_(3)` is :

A

same

B

unprdicated

C

lower

D

higher.

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaG^(@)` for the formation of `Cr_(2)O_(3)` is higher. That is why `Cr_(2)O_(3)` can be reduced by aluminium metal where as the reverse is not true.
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when compared to DeltaG^(@) for the formation of A1_(2)O_(3) the Deltag^(@) for the formation of Cr_(2)O_(3) is

The value of Delta _(f) f^(Ө) for formation of Cr_(2) O_(3) is – 540 kJmol−1and that of Al_(2) O_(3) is – 827 kJmol^(−1) . Is the reduction of Cr_(2) O_(3) possible with Al ?

Assertion : Delta_(f)G^(@) for the formation of Al_(2)O_(3) " and " Cr_(2)O_(3) involving one mole of oxygen are -827 " kJ mol"^(-1) " and " -540 " kJ mol"^(-1) respectively Reason : Al can reduce Cr_(2)O_(3) " since " Delta_(f)G^(2) for its formation is less.

DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Multiple Choice
  1. Which of the following is not an ore of aluminium ?

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  2. Which of the following factors is of no significance for roasting sulp...

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  3. When compared to DeltaG^(@) for the formation of Al(2)O(3), DeltaG^(@)...

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  4. Native silver metal forms a water soluble complex with a dilute soluti...

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  5. Which method of purification is represented by the following equations...

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  6. Aluminium is extracted from alumina (Al(2)O(3)) by electrolysis of a m...

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  7. Which one of the following is a mineral of iron ?

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  8. In the cyanide extraction process of silver from argentite ore, the ox...

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  9. Sulphide ores are common for the metals

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  10. The metallic lustre of metals is due to :

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  11. The process of zone refining is used in the purification of :

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  12. Which is an oxide ore ?

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  13. In the metallurgy of iron, when lime stone is added to blast furnace, ...

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  14. The statement that is NOT correct is that

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  15. Cryolite is

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  16. In the extraction of copper from its sulphide ore, the metal is finall...

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  17. Metals are usually not found as nitrates in their ores. Out of the fol...

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  18. In the context of the Hall-Heroult process for the extraction of Al, w...

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  19. Roasted gold ore +CN^(-)+H(2)O overset(O(2)) to [X]+OH^(-)

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  20. Which of the following ores is best concentrated by Froth Floatation p...

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