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Question
Chemistry
The green colour produced in the borax bead test of a chromium (III) salt is due to
Q. The green colour produced in the borax bead test of a chromium (III) salt is due to
3000
201
JEE Advanced
JEE Advanced 2019
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A
C
r
(
B
O
2
)
3
69%
B
C
r
2
(
B
4
O
7
)
3
15%
C
C
r
2
O
3
15%
D
C
r
B
0%
Solution:
In the borax bead test, metal oxide reacts with a glassy bead to form metaborates.
N
a
2
B
4
O
7
⋅
10
H
2
O
Δ
N
a
2
B
4
O
7
Δ
N
a
B
O
2
+
B
2
O
3
C
r
2
O
3
+
B
2
O
3
Δ
Green
C
r
(
B
O
2
)
3