(B) The correct answer is $B$. The statement that the impurities present in cast iron are oxidised by air is incorrect. In the reverberatory furnace,t

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The impurities present in cast iron are oxidised by air.

(B) The correct answer is $B$. The statement that the impurities present in cast iron are oxidised by air is incorrect. In the reverberatory furnace,the impurities in cast iron are primarily oxidised by $Fe_2O_3$ (hematite) added to the mixture,not by air directly.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

Easy

Mark the wrong statement.

A
Wrought iron is prepared by heating cast iron in a reverberatory furnace.
B
The impurities present in cast iron are oxidised by air.
C
The impurities are oxidised by $Fe_2O_3$.
D
$CO$ burns with blue flame and the $Si, Mn$ and other impurities form slag with silica.