First slide

13th group or boron group

Question

Boric acid on heating at $100^{0} C$ gives X. X on heating at $160^{\circ} C$ gives Y and Y on heating at red hot gives $B_{2} O_{3}$ . Find X and Y.

Moderate

A

$H_{2} B_{6} O_{9}, H_{2} B_{4} O_{7}$
B

$H B O_{2}, H_{2} B_{4} O_{7}$
C

$H_{2} B_{4} O_{7}, H B O_{2}$
D

$H_{2} B_{4} O_{7}, H_{2} B_{6} O_{9}$

Solution

Following is the heating effect.
$H_{2} B O_{3} \overset{100^{0} C}{\to} H B O_{2} \overset{160^{0} C}{\to} H_{2} B_{4} O_{7} \to B_{2} O_{3}$

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