Q11 of 21 Page 300

Define the temp i) gauge ii) slag.

i) gauge


The unwanted rocky materials or impurities present in the ore are called gangue.


ii) slag


The impurities that are obtained during the poling process gets oxidized to form scum over the surface of the molten metal. This scum is called slag.


More from this chapter

All 21 →
9

Write short notes on each of the following:

i) Roasting ii) Calcinations iii)Smelting.


 10

What is the difference between roasting and calcinations? Give one example for each?

 12

Magnesium is an active metal if it occurs as chloride in nature, which method of reduction is suitable for its extraction?

 13

Mention two methods which produce very pure metals?