Which zone of the blast furnace has the highest temperature?

$Ni$ anode is used in the electrolytic extraction of

What is the role of flux in metallurgical processes?

Which of the following oxides can be reduced to the metal by heating it in a stream of hydrogen?

Pure $O_2$ instead of air is used to oxidise the pig iron because

The compound$(s)$ that is(are) removed as slag during the extraction of copper is:
$1. CaO$
$2. FeO$
$3. Al_{2}O_{3}$
$4. ZnO$
$5. NiO$
Choose the correct answer from the options given below.