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CBSE Class 10 Answered

Describe the use of aluminium as a reducing agent for the reduction of metal oxides. Give the equations involved.
Asked by SINGHHARMEL26 | 28 Feb, 2019, 11:25: AM
answered-by-expert Expert Answer
Aluminium is used as a reducing agent in the extraction of metals in those cases where the

metal oxide is of a comparatively more reactive metal than zinc etc,. which cannot be satisfactorily reduced by carbon.

For example: The oxides of manganese and chromium metals are not satisfactorily reduced by carbon.

So, these metals are extracted by the reduction of their oxides with aluminium powder.

Aluminium powder reduces the metal oxide to metal and  itself gets  oxidised to aluminium oxide.

Example: When manganese dioxide is heated with aluminium powder, then manganese metal is produced.


     space space space 3 MnO subscript 2 subscript left parenthesis straight s right parenthesis subscript blank end subscript space plus space 4 Al subscript left parenthesis straight s right parenthesis end subscript space rightwards arrow space 3 Mn subscript left parenthesis straight l right parenthesis end subscript space plus space 2 Al subscript 2 straight O subscript 3 left parenthesis straight s right parenthesis end subscript space plus space Heat

This reduction reaction of manganese dioxide with aluminium is a highly exothermic reaction.

Answered by Varsha | 28 Feb, 2019, 11:50: AM
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