First slide

Orthoboric acid

Question

$\large H_3BO_3 \xrightarrow{{Red\; heat}}\ X$ . ‘X’ in the reaction is

Easy

A

H₂B₄O₇
B

HBO₂
C

B₂O₃
D

B

Solution

$2{H_3}B{O_3}\xrightarrow{{\operatorname{Re} d\,\,\,heat}}\,\mathop {{B_2}{O_3}}\limits_X + 3{H_2}O$
OR
$2{H_3}B{O_3}\mathop {\xrightarrow{{ - {H_2}O}}}\limits_\Delta \,\mathop {HB{O_2}}\limits_{Meta\,boric\,acid}$
$4\mathop {HB{O_2}}\limits_{Meta\,boric\,acid} \mathop {\xrightarrow{{ - {H_2}O}}}\limits_\Delta \,\mathop {{H_4}{B_2}{O_7}}\limits_{Tetra\,\,boricacid} \mathop {\xrightarrow{{ - {H_2}O}}}\limits_\Delta \,\mathop {2{B_2}{O_3}}\limits_{Boric\,\,anhydride}$

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