Discussion
Assertion (A): Substituting nepheline syenite for feldspar can lower the firing temperature of a body.
Reason (R): It carries more alkali and less silica, so it acts as a stronger flux.
Answer: C
Both are true and the reason gives the chemistry: more alkali per unit mass means more melt at a given temperature, which is what allows the peak to be reduced or the quantity of flux to be cut back. The saving in fuel is weighed against the narrower firing range.
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