Explain what happens when boric acid is heated.
On heating orthoboric acid $(H_{3}BO_{3})$ at $370 \ K$ or above,it loses a water molecule to form metaboric acid $(HBO_{2})$.
On further heating,metaboric acid loses more water to yield boric oxide $(B_{2}O_{3})$.
The reactions are as follows:
$H_{3}BO_{3} \xrightarrow{370 \ K} HBO_{2} + H_{2}O$
$2HBO_{2} \xrightarrow{\Delta} B_{2}O_{3} + H_{2}O$
On further heating,metaboric acid loses more water to yield boric oxide $(B_{2}O_{3})$.
The reactions are as follows:
$H_{3}BO_{3} \xrightarrow{370 \ K} HBO_{2} + H_{2}O$
$2HBO_{2} \xrightarrow{\Delta} B_{2}O_{3} + H_{2}O$
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Consider the following statements about group $13$ elements:
$A$. $AlCl_3$ achieves stability by forming a dimer.
$B$. $BCl_3$ is an electron-deficient molecule.
$C$. $E^0_{M^{3+}/M^0} \ (V)$ is $+1.26 \ V$ for aluminium.
$D$. In $+1$ oxidation state, thallium is unstable.
The incorrect statements are:
$A$. $AlCl_3$ achieves stability by forming a dimer.
$B$. $BCl_3$ is an electron-deficient molecule.
$C$. $E^0_{M^{3+}/M^0} \ (V)$ is $+1.26 \ V$ for aluminium.
$D$. In $+1$ oxidation state, thallium is unstable.
The incorrect statements are:
Which one of the following molecular hydrides acts as a Lewis acid?
MediumAIPMT 2010
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