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Question
Chemistry
When potassium dichromate crystals are heated, we get
Q. When potassium dichromate crystals are heated, we get
1914
204
Rajasthan PMT
Rajasthan PMT 2003
Some Basic Concepts of Chemistry
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A
oxygen
B
hydrogen
C
sulphur dioxide
D
hydrogen sulphide
Solution:
Potassium dichromate, on heating, gives oxygen and green chromic oxide
(
C
r
2
O
3
)
vapour.
4
K
2
C
r
2
O
7
Δ
4
K
2
C
r
O
4
+
green
2
C
r
2
O
3
↑
+
3
O
2
↑
Though ammonium dichromate, on heating gives nitrogen gas.
(
N
H
4
)
2
C
r
2
O
7
Δ
N
2
+
C
r
2
O
3
+
4
H
2
O