Which of the following statements is correct?

  • A
    Basicity of phosphorous acid $(H_3PO_3)$ is $3$.
  • B
    Perchloric acid $(HClO_4)$ has one peroxy linkage.
  • C
    Solid $SO_3$ does not have a cyclic structure.
  • D
    Borazine $(B_3N_3H_6)$ has a zero dipole moment.

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What are $X$ and $Y$ respectively in the following reactions?
$X \xleftarrow{CO} B_2 H_6 \xrightarrow[(C_2 H_5)_2 O]{NaH} Y$

Substance $X$ reacts with an aqueous solution of $NaOH$ to form $Y$ and releases $H_2$ gas. When an aqueous solution of $Y$ is heated at $323 \; K - 333 \; K$ and $CO_2$ gas is passed through it,it yields $Al_2O_3 \cdot xH_2O$ (often represented as $Al(OH)_3$) and $Z$. Heating $Z$ at $1200^{\circ}C$ produces $Al_2O_3$. Identify $X, Y,$ and $Z$.

What is the nature of $Al_2O_3$?

When $B_2H_6$ reacts with excess $NH_3$ at a very high temperature $(> 200 \, ^\circ C)$,the product formed is:

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