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Question
Chemistry
What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire?
Q. What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire?
1195
206
The p-Block Elements
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A
A transparent white bead is formed
20%
B
A bright pink coloured
N
a
B
O
2
bead is formed
10%
C
A blue coloured
C
o
(
B
O
2
)
2
bead is formed
70%
D
A red coloured
C
o
(
B
O
2
)
2
bead is formed
0%
Solution:
N
a
2
B
4
O
7
⋅
10
H
2
O
Δ
N
a
2
B
4
O
7
Δ
2
N
a
B
O
2
+
B
2
O
3
B
2
O
3
+
C
o
O
→
Cobalt metaborate (blue bead)
C
o
(
B
O
2
)
2