Answer:
The role of magnesium oxide is to
act as flux (basic) and it removes certain acidic impurities in the form of
slag.
\[MgO\,\,\,\,\,+\,\,\,\,\,\,\,Si{{O}_{2}}\,\,\,\,\,\,\xrightarrow{\,}\,\,\underset{\text{Magnesium}\,\,\text{silicate}}{\mathop{MgSi{{O}_{3}}}}\,\]
\[3MgO\,\,\,\,\,+\,\,\,\,\,\,\,{{P}_{2}}{{O}_{5}}\,\,\,\,\,\,\xrightarrow{\,}\,\,\underset{\text{Magnesium}\,\,\text{phosphate}}{\mathop{M{{g}_{3}}{{(P{{O}_{4}})}_{2}}}}\,\]
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