When CO2 is passed through solution of sodium aluminate, precipitate of which compound is formed?
Al(OH)3
Al2O3
Na2CO3
No ppt
Which of the following is not the correct match?
Leaching : Ag
Zone refining : Sn
Liquation : Pb
van Arkel : Zr
The purpose of smelting an ore is to :
oxidise it
reduce it
obtain an alloy
separate volatile impurities
B.
reduce it
Smelting involves more than just ' melting the metal out of its ore ' .The purpose of smelting an ore is to reduce it .
What is the role of aniline or cresol when added in a froth floatation process?
Stabilizer
Depressant
Wetting agent
All of these