Explain what happens when boric acid is heated.
Explain what happens when boric acid is heated.
On heating orthoboric acid $\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)$ at $370 \mathrm{~K}$ or above, it changes to metaboric acid $\left(\mathrm{HBO}_{2}\right)$. On further heating, this yields boric oxide $\mathrm{B}_{2} \mathrm{O}_{3}$.
$\mathrm{H}_{3} \mathrm{BO}_{3} \stackrel{370 \mathrm{~K}}{\longrightarrow} \mathrm{HBO}_{2} \longrightarrow \mathrm{B}_{2} \mathrm{O}_{3}$
Similar Questions
Given below are two statements :
Statement $I$ : Gallium is used in the manufacturing of thermometers.
Statement $II$ : A thermometer containing gallium is useful for measuring the freezing point ( $256 \mathrm{~K}$ ) of brine solution.
In the light of the above statement, choose the correct answer from the options given below :
Given below are two statements :
Statement $I$ : Gallium is used in the manufacturing of thermometers.
Statement $II$ : A thermometer containing gallium is useful for measuring the freezing point ( $256 \mathrm{~K}$ ) of brine solution.
In the light of the above statement, choose the correct answer from the options given below :
- [JEE MAIN 2024]
Write balanced equations for :
$(i)\,B{F_3} + LiH \to $
$(ii)\,{B_2}{H_6} + {H_2}O \to $
$(iii)\,NaH + {B_2}{H_6} \to $
$(iv)\,{H_3}B{O_3}\xrightarrow{\Delta }$
$(v)\,Al + NaOH \to $
$(vi)\,{B_2}{H_6} + N{H_3} \to $
Write balanced equations for :
$(i)\,B{F_3} + LiH \to $
$(ii)\,{B_2}{H_6} + {H_2}O \to $
$(iii)\,NaH + {B_2}{H_6} \to $
$(iv)\,{H_3}B{O_3}\xrightarrow{\Delta }$
$(v)\,Al + NaOH \to $
$(vi)\,{B_2}{H_6} + N{H_3} \to $
- In the reaction
$2 {X}+\mathrm{B}_2 \mathrm{H}_6 \rightarrow\left\lfloor\mathrm{BH}_2(\mathbf{X})_2\right\rfloor^{+}\left\lfloor\mathrm{BH}_4\right]^{-}$ the amine(s) ${X}$ is$(are)$
$(A)$ $\mathrm{NH}_3$ $(B)$ $\mathrm{CH}_3 \mathrm{NH}_2$ $(C)$ $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$ $(D)$ $\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$
- In the reaction
$2 {X}+\mathrm{B}_2 \mathrm{H}_6 \rightarrow\left\lfloor\mathrm{BH}_2(\mathbf{X})_2\right\rfloor^{+}\left\lfloor\mathrm{BH}_4\right]^{-}$ the amine(s) ${X}$ is$(are)$
$(A)$ $\mathrm{NH}_3$ $(B)$ $\mathrm{CH}_3 \mathrm{NH}_2$ $(C)$ $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$ $(D)$ $\left(\mathrm{CH}_3\right)_3 \mathrm{~N}$
- [IIT 2009]
Why does boron trifluoride behave as a Lewis acid?
Why does boron trifluoride behave as a Lewis acid?
The incorrect stability order of $+3$ and $+1$ states of $13^{th}$ group elements (boron family) is
The incorrect stability order of $+3$ and $+1$ states of $13^{th}$ group elements (boron family) is