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KCET 2021 Chemistry Solved Paper
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© examsnet.com
Question : 46
Total: 60
A colourless, neutral, paramagnetic oxide of nitrogen 'P' on oxidation gives reddish brown gas Q. Q on cooling gives colourless gas R. R on reaction with P gives blue solid S. Identify P, Q, R, S respectively
N
2
O
,
NO
,
NO
2
,
N
2
O
5
N
2
O
,
NO
2
,
N
2
O
4
,
N
2
O
3
NO
,
NO
2
,
N
2
O
4
,
N
2
O
3
NO
,
NO
,
N
2
O
4
,
N
2
O
5
Validate
Solution:
The complete given chemical reaction take place as follows
2
NO
(
g
)
Nitric
oxide
(
P
)
(
Colourless
gas
)
+
O
2
→
2
NO
2
(
g
)
Nitrogen
dioxide
(
Q
)
(
Reddash
brown
gas
)
Colling
→
N
2
O
4
(
g
)
Dinitroger
tetraoxjde
(
R
)
(
Colourless
)
2
NO
→
2
N
2
O
3
(
g
)
Dinitrogen
trioxide
(
S
)
(
Blue
solid
)
Note
Nitric oxide is paramagnetic as il contain unpaired electron as per molecular orbital theory.
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