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Is it true that certain conditions Mg can reduce SiO_(2) and Si can reduce MgO? What are those conditions? |
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Answer» Solution :Free energy for the OXIDATION of an element changes with temperature and sometimes there is an abrupt change in its value due to phase change `(s to l)" or "(l to v)`. AMORPHOUS SILICON is obtained by the reduction os `SiO_(2)` with burning Mg wire `SiO_(2) +2Mg to Si+ 2MgO` Si, when HEATED with MgO at very high temperature say `1000""^(@)C" form "SiO_(2)` and Mg metal is obtained. `2MgO+Si overset(1000""^(@)C)(to) 2Mg+SiO_(2)` We can ascertain from Ellingham DIAGRAM which metal oxide can be reduced by which metal and at which temperature. |
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