1.

Is ittruethatundercertainconditions, Mg canreduceSiO _ 2andSicanreduceMgO?Whataretheconditions ?

Answer»

Solution :Below 1973 K ,the` Delta _fG^(@) `curvefortheformation of` SiO_ 2` liesabove the`Delta_ fG ^(@) `curvefortheformationofMgO, therefore, attemperaturesbelow1973 K , MG can reduce`SIO _2`tometallic silicon
` ""SiO_2+2Mg OVERSET (lt 1973K)TO2 MgO+Si ,Delta_rG^(@)=- ve`
Above 1973K, the` Delta _ fG^(@) `curvefor theformation of` SiO_2`liesbelowthe CORRESPONDING curvefor theformastionofMgO. Therefore,above1973 K, siliconcan reduceMgOtoMg.
` "" Si +2MgOoverset ( gt 1973K) toSiO _2+2Mg`


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