Which of the following statements is incorrect?

  • A
    Boron carbide is used as an abrasive.
  • B
    Boron is used to increase the hardness of steel.
  • C
    Boron sesquioxide $(B_2O_3)$ is used in the manufacture of borosilicate glass.
  • D
    Orthoboric acid contains intermolecular $H$-bonding.

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Aluminium reacts with caustic soda to form

Anhydrous $AlCl_3$ is obtained from

Group $13$ elements show $+1$ and $+3$ oxidation states. The relative stability of the $+3$ oxidation state is given as:

Which reactions can be used to prepare diborane?
$I.$ $3NaBH_4 + 4BF_3 \xrightarrow{\text{ether}} 2B_2H_6 + 3NaBF_4$
$II.$ $2NaBH_4 + I_2 \to B_2H_6 + 2NaI + H_2$
$III.$ $2BF_3 + 6NaH \xrightarrow{450 \ K} B_2H_6 + 6NaF$

Give the chemical reaction of aluminum with dilute $HCl$.

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