With impurities like P and S the open hearth furnace is lined with ?
Correct answer: D. CaO MgO
- A. SiO2
- B. Fe2O3
- C. FeO
- D. CaO MgO
Explanation
Phosphorus and sulfur are acidic impurities, so the open-hearth furnace is lined with basic refractory materials such as CaO and MgO, which react with them to form slag. Students may choose SiO2, but silica is an acidic oxide and would not effectively remove acidic impurities by an acid-base reaction.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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