Purification And Characterisation Of Organic Compounds Question 161
Question: The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag
Options:
A) $ Fe_2O_3(s)+3CO(g)\to 2Fe(l)+3CO_2(g) $
B) $ CaCO_3(s)\to CaO(s)+CO_2(g) $
C) $ CaO( s )+SiO_2( s )\to CaSiO_3( s ) $
D) $ 2C( s )+O_2( g )\to 2CO( g ) $
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Answer:
Correct Answer: C
Solution:
[c] In blast furnace at about 1270 K, calcium carbonate is almost completely decomposed to give $ CaO $ which acts as a flux and combines with $ SiO_2 $ present as impurity (gangue) in the ore to form calcium silicate (fusible slag) $ \underset{( basicflux )}{\mathop{CaO(s)}}+\underset{( acidicflux )}{\mathop{SiO_2(s)}}\xrightarrow{{}}\underset{( slag )}{\mathop{CaSiO_3(s)}} $
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