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Byju's Answer
Standard X
Chemistry
Redox Reaction
What is the r...
Question
What is the role of lime or limestone in the extraction of Iron?
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Solution
The chemical formula of limestone is
CaCO
3
.
Limestone is a basic flux that can be used to form fusible slag from earthly impurities present in the ore.
Limestone undergoes decomposition to form lime i.e. Calcium oxide
(
CaO
)
and Carbon dioxide.
The decomposition reaction occurs as follows:
CaCO
3
s
Limestone
→
CaO
s
(
Lime
)
+
CO
2
g
The lime thus formed reacts with the Silicate present in the ore of Iron which is Silicon oxide.
The chemical reaction occurs as follows:
CaO
s
(
Lime
)
+
SiO
2
s
(
Silicates
)
→
CaSiO
3
l
Calcium
silicate
(
Slag
)
Thus, limestone can be used to
remove unwanted impurities
from the ore of Iron during extraction.
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