Question

In metallurgy, flux is a substance used to convert
A. Infusible impurities to fusible material
B. Soluble impurities to insoluble impurities
C. Fusible impurities to infusible impurities
D. Mineral into silicate

Answer 1

Hint: In metallurgy or specially in the process smelting, molten of fusible metal is produced from infusible ore. This process generally takes place in the presence of heat, reducing agent and flux.

Complete Step by Step Answer:
In the process metallurgy, a flux is defined as a chemical that acts as a cleaning agent, flowing agent, or purifying agent. Fluxes are used in both extractive metallurgy and metal joining processes.

Some examples of fluxes are sodium carbonate, charcoal, potash, lime water, lead sulphide, borax, a borane compound and coke. Certain minerals containing phosphorus are also used as a flux. Iron ore is also used as a flux in the process of smelting of copper. The main purposes of flux are as a reducing agent, preventing oxides from forming on the surface of the molten metal.

Thus flux acts as a reducing agent and converts the infusible metal oxide ore to fusible metal or molten metal.
Thus the correct option is A.

Note: Flux is widely used in smelting. By using flux generally metals like copper, iron, lead, cadmium, platinum etc are produced. These metals are produced in molten state, which means the state where a metal melts.