Which of the following statements is incorrec | vedclass

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(D) $1$. Boron carbide $(B_4C)$ is extremely hard and is used as an abrasive.$2$. Boron is added to steel to increase its hardness and strength.$3$. B

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Orthoboric acid contains intermolecular $H$-bonding.

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(D) $1$. Boron carbide $(B_4C)$ is extremely hard and is used as an abrasive.$2$. Boron is added to steel to increase its hardness and strength.$3$. Boron sesquioxide $(B_2O_3)$ is a key component in the production of borosilicate glass (e.g.,Pyrex).$4$. Orthoboric acid $(H_3BO_3)$ consists of layers of $BO_3^{3-}$ units held together by intermolecular hydrogen bonding,not intramolecular. Therefore,the statement claiming it has intramolecular $H$-bonding is incorrect.

Column-$1$ (Reaction)	Column-$2$ (Main product)
$A$. $B_2H_6 + 2CO \longrightarrow$	$I$. $B_2O_3$
$B$. $B_2H_6 + 3O_2 \longrightarrow$	$II$. $2BH_3 \cdot CO$
$C$. $B_2H_6 + 6H_2O \longrightarrow$	$III$. $2H_3BO_3$

Which of the following statements is incorrect?

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