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The choice of reducing agent for metal o...

The choice of reducing agent for metal oxide is decided by thermodynamic principles of metallurgy. `Delta G` must be negative. Ellingham diagram is a plot of `Delta_(f)G^(0)` vs T for the formation of oxides of various elements. All the plots slope upwards when temperature increases. Each plot is a straight line except when some change in phase takes place. A metal will reduce the oxide of other metals which lie above it in this diagram.
At a temperature below 1623 K. Al cannot reduce

A

FeO

B

CrO

C

MgO

D

NiO

Text Solution

Verified by Experts

The correct Answer is:
C
AI can.t reduce MgO as Mg is more electropositive.
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