First slide

Orthoboric acid

Question

What are A, B and C in the following set of reactions?
$H_{3} {BO}_{3} \overset{100 ° C}{⟶} A \overset{140 - 160 ° C}{⟶} B \overset{Δ}{⟶} C$

Moderate

A

A-B₂O₃; B-H₂B₄O₇; C-HBO₂
B

A-HBO₂; B-H₂B₄O₇; C-B₂O₃
C

A-H₂B₄O₇; B-B₂O₃; C-HBO₂
D

A-H₂B₄O₇; B-HBO₂; C-B₂O₃

Solution

$\underset{O r t h o b o r i c a e i d}{H_{3} {BO}_{3}} \overset{100^{°} C}{\to} \underset{M e t a b o r i c a c i d}{{HBO}_{2}} + H_{2} O$
$4 HB O_{2} \overset{140 - 160^{o} C}{\to} \underset{Tetraboric acid}{H_{2} B_{4} O_{7}} + H_{2} O$
$H_{2} B_{4} O_{7} \overset{Δ}{\to} 2 B_{2} O_{3} + H_{2} O$

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