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
What is the role of aniline or cresol when added in a froth floatation process?
Stabilizer
Depressant
Wetting agent
All of these
Maximum number of molecules of CH3I that can react with a molecule of CH3NH2 are :
3
4
2
1
A.
3
Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of metals?
FeO, SnO
SnO, ZnO
BaO, Na2O2
FeO, ZnO