Bausite zincate / Hom solver formulae Al203.2H₂O zno Agel Galena Rock salt Pbs haol which metal is extracted from bauxite? which are contains sulphate & 9. у list the pyrometallurgical process? name the metals obtained by is electric repening! emais a neat dogram of reverboratory Drawo furnance and tabel it heatly ?
Answers
Answer:
(a) Aluminium metal is extracted from bauxite ore. The aluminium compound present in this ore is aluminium oxide. The chemical formula of the ore is
A
l
2
O
3
.2
H
2
O
(b) Hematite is an ore of iron. The iron compound present in hematite ore is iron (III) oxide. The formula of the ore is \)Fe_2O_3\).
(c) Zinc blende (ZnS) is the sulphide ore of zinc. The extraction of zinc from zinc blende involves two steps. First, the concentrated zinc blende is converted to its oxide (by roasting). After this, the oxide is reduced to zinc metal. The reactions for the two processes are:
1. Roasting: Zinc blende is subjected to roasting, i.e. it is heated in the presence of excess air. This converts zinc sulphide ore to zinc oxide.
The reaction involved is:
2
Z
n
S
(
s
)
+
3
O
2
(
g
)
R
o
a
s
t
i
n
g
(
s
u
r
p
l
u
s
o
f
a
i
r
)
−−−−−−−−−−−−−−−→
2
Z
n
O
(
s
)
+
2
S
O
2
(
g
)
2. Reduction: Zinc oxide is then reduced by coke (carbon). When zinc oxide is heated with coke, carbon acts as a reducing agent and reduces zinc oxide to zinc metal.
Z
n
O
(
s
)
+
C
(
s
)
r
e
d
u
c
t
i
o
n
−−−−−→
Z
n
(
s
)
+
C
O
(
g
)
(d) The galvanised iron-zinc oxide layer coating on iron objects prevents zinc and iron under it from corrosion. This happens because zinc is more reactive than iron. If the zinc layer is broken, zinc, being more reactive, gets oxidised before iron and prevents its corrosion.
(e) Aluminium is a common metal that is highly resistant to corrosion because it is a highly reactive metal. It reacts easily with oxygen in the air and forms a layer of aluminium oxide on its surface. This aluminium oxide layer is very tough and does not allow air to enter the metal for further reaction, thus preventing further corrosion of aluminium.
Answer:
sodium
potassium
silica
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