For the removal of a basic impurity like lime, which of the following substances is the most suitable flux?

Options :
  1. Magnesium oxide
  2. Iron oxide
  3. Sand
  4. Carbon black
Answer and Explanation :-

Answer: Option 3

Explanation:

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When thought is in bondage the truth is hidden, for everything is murky and unclear, and the burdensome practice of judging brings annoyance and weariness. What benefit can be derived from distinctions and separations?
-Sengcan Hsin Hsin Ming