First slide

Orthoboric acid

Question

Which of the following will not give orthoboric acid?

Moderate

A

B + HNO₃ (conc.)
B

B + H₂SO₄ (conc.)
C

B + HCl(conc.)
D

B₂H₆ + H₂O

Solution

$B + 3 {HNO}_{3} \to H_{3} {BO}_{3} + 3 {NO}_{2}$
$2 B + 3 H_{2} {SO}_{4} \to 2 H_{3} {BO}_{3} + 3 {SO}_{2}$
$2 B + 6 HCl \to 2 {BCl}_{3} + 3 H_{2}$
$B_{2} O_{3} + 3 H_{2} O \to 2 H_{3} {BO}_{3}$

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