Question

. ....... heating the concentrated ore in a current of air at temperature below its melting point *



a)Calcination

b)Roasting

c)Leaching



​

Answer 1

Answer:

Calcination is the process in which concentrated ore is heated to a high temp (just below its fusion temp) in the absence of air.

Roasting is the process in which air is passed while heating the concentrated ore below its melting point.

Smelting is a metallurgical process in which less electropositive metal ore such as PbO, Cr2 ,03

 are reduced to free metal using the powerful reducing agent like Al, C, CO etc.

Metals like Cu and Tin are separated from their respective oxides by Poling process using green bamboo stick.

Option A is correct.

Answer 2

Answer:

hlooooo

sanjuuu

class epola kazhiyunee

kaicho????