In which of the following pair of metals, both are commercially extracted from their respective ores by carbon reduction method?

For the following statements, mark $'T'$ for true and $'F'$ for false statement.

Statement $1$ : $SnO_2$ $+$ wolframite, in this $SnO_2$ is magnetic while wolframite is non magnetic in nature.

Statement $2$ : Argentite ore is concentrated by froth floatation method.

Statement $3$ : Copper and lead ores are reduced by self reduction method.

Statement $4$ : In metallurgy of $Fe,\,CO$ is used as reducing agent at low temperature

Select the incorrect one

Which of the following pair of ores can not be converted into corresponding metals by pyrometallurgy ?

$B_4C$ (boron carbide) is used except :