1.

Though H_(2) is a good reducing agent why is it not used as a reductant in metallurgy?

Answer»

Solution :When `H_(2)` is used in the reduction of a metallic oxide, itself gets oxidised to `H_(2)O`. Change from gaseous to liquid state decreases `DeltaS`:
`MO(s)+H_(2)(G)rarrM(s)+H_(2)O(l)`
`therefore""Deltas=-ve and DELTAG` becomes less `-ve` (increases).
So, thermodynamic feasibility of the reaction decreases.
Absorption of `H_(2)` to form a METAL HYDRIDE also decreases its tendency to reduce metal oxides and so not used in metallurgy.


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