Select the incorrect statement.

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(B) $1$. Cerrusite is $PbCO_3$ (a carbonate ore),which is concentrated by gravity separation or froth floatation,but it is not the primary method. How

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Roasting process is involved for extraction of iron.

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(B) $1$. Cerrusite is $PbCO_3$ (a carbonate ore),which is concentrated by gravity separation or froth floatation,but it is not the primary method. However,statement $A$ is generally considered acceptable in some contexts. $2$. In the extraction of iron,the process involves calcination and smelting in a blast furnace,not roasting. Roasting is typically used for sulfide ores. Thus,statement $B$ is incorrect. $3$. Serpeck's process is used for the purification of bauxite $(Al_2O_3)$. The byproduct is $AlN$ (Aluminum Nitride),not silicon. Thus,statement $C$ is also incorrect. $4$. Cassiterite $(SnO_2)$ and Rutile $(TiO_2)$ are indeed oxide ores. Given the standard curriculum,both $B$ and $C$ contain inaccuracies,but $B$ is a fundamental error regarding iron metallurgy.

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