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Q)
In the reaction
H
3
B
O
3
→
375
k
A
→
475
k
B
→
r
e
d
h
e
a
t
C
The compounds A, B and C respectively are
(
A
)
B
2
O
3
,
H
2
B
4
O
7
,
H
B
O
2
(
B
)
B
2
O
3
,
H
B
O
2
,
H
2
B
4
O
7
(
C
)
H
2
B
4
O
7
,
H
B
O
2
,
B
2
O
3
(
D
)
H
B
O
2
,
H
2
B
4
O
7
,
B
2
O
3
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