Question

Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron?

• A. The slag is lighter and has lower melting point than the metal
• B. The slag is heavier and has lower melting point than the metal
• C. The slag is lighter and has higher melting point than the metal
• D. The slag is heavier and has higher melting point than the metal

Answer 1

The correct option is A The slag is lighter and has lower melting point than the metal

Slag is a glassy by-product obtained from the extraction of metal from its ore. It is a mixture of unwanted oxide and silicon dioxide (eg. $CaSi{O}_3,FeSi{O}_{3}etc.$). It has a lower melting point, is not miscible with the molten metal and lighter than the molten metal.