Which of the following statements is correct?

Options

A. Slag is carefully chosen to combine with the flux present in the ore to produce easily fusible gangue to carry away the impurities.
B. Gangues are carefully chosen to combine with the slag present in the ore to produce easily fusible flux to carry away the impurities.
C. Gangues are carefully chosen to combine with flux present in the ore to produce easily fusible slagt carry away the impurities.
D. Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusiblesla to carry away the impurities.

Answer

D

Explanation

Fluxes are the substances that combine with the ganuge particles to form an easily fusible material calied slag.
The slag thus formed is insoluble in the molten metal and being lighter floats on the surface of the metal from which it can be removed from time to time. Gangue cannot be chosen as they are the impurities already present in the metal ore.
Slag cannot be chosen as it is formed when fluxes react with the gangue particles only.