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p-Block Elements: Groups 13 and 14
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Boron compounds: diborane, boric acid, borax, boron halides
NEET level
Single correct option
Difficulty 1 of 3
pb005
The molecular formula of borax (crystalline, as usually written) is
A
NaBO
X
2
⋅
10
H
X
2
O
B
Na
X
2
B
X
4
O
X
7
⋅
10
H
X
2
O
C
Na
X
2
B
X
4
O
X
7
⋅
4
H
X
2
O
D
Na
X
3
BO
X
3
⋅
10
H
X
2
O
Answer: B
Borax is sodium tetraborate decahydrate,
Na
X
2
B
X
4
O
X
7
⋅
10
H
X
2
O
, which is the same as
Na
X
2
[
B
X
4
O
X
5
(
OH
)
X
4
]
⋅
8
H
X
2
O
.
Practice p-Block Elements: Groups 13 and 14
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