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Which of the following statements is correct?

1. Gangues are carefully chosen to combine with the slag present in the ore to form an easily fusible flux that removes the impurities.
2. Slags are carefully chosen to combine with the flux present in the ore to form an easily fusible gangue that removes the impurities.
3. Gangues are carefully chosen to combine with the flux present in the ore to form an easily fusible slag that removes the impurities.
4. Fluxes are carefully chosen to combine with the gangue present in the ore to form an easily fusible slag that removes the impurities.

Correct answer: Fluxes are carefully chosen to combine with the gangue present in the ore to form an easily fusible slag that removes the impurities.

Solution

A flux is chosen to combine with the gangue (unwanted earthy impurity) in the ore to form an easily fusible slag, which is then removed. Hence the correct statement is that fluxes combine with the gangue to give slag.

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