Question

The substance added to the ore to reduce fusion temperature is called.

Answer 1

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ANSWER::

The substance added to the ore to reduce fusion temperature is called flux.

Extra Information - Impurities + Flux → Fusible product (slag)

Flux combines with impurities to form fusible product which is known as slag . Flux is used to make conducting ore , reduce melting point and to remove all basic and acidic impurities .

Example -

FeO    +     SiO₂ → FeSiO₃ (Fusible Slag)

Impurity   Acidic flux

Hope it helps!