EXTRACTION OF ZINC Flashcards
1
Q
What is the ore of zinc?
A
Zinc blende
2
Q
What is the compound name of zinc blende?
A
Zinc sulphide (ZnS)
3
Q
What happens to ZnS at first?
A
It is roasted in air.
4
Q
What is obtained after it roasted in air?
A
It gives Zinc oxide and Sulphur dioxide.
5
Q
Write the chemical equation of zinc blende being roasted in air.
A
2 ZnS (s) + 3 O2 (g) —-> 2 ZnO (s) + 2 SO2 (g)
6
Q
What happens to at first in the blast furnace? Include 2 chemical equations.
A
C (s) + O2 (g) —-> CO2 (g)
CO2 (g) + C (s) 2CO (g)
7
Q
What happens after Zinc oxide gets reduced by carbon monoxide?
A
ZnO (s) + CO (g) —-> Zn (g) + CO2 (g)
8
Q
Why isn’t limestone added?
A
Because Zn is a gas
9
Q
What happens to zinc vapor after it passes out of the furnace?
A
It is cooled and condensed.
