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VITEEE 2021 Solved Paper
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© examsnet.com
Question : 17
Total: 80
The root mean square velocity of hydrogen molecules at 300 K is 1930 metre/sec. Then the r.m.s velocity of oxygen molecules at 1200 K will be
482.5
metre/sec
965 metre/sec
1930 metre/sec
3860 metre/sec
Validate
Solution:
Root-mean square-velocity is given by
v
rms
=
√
3
RT
M
i.e.,
v
rms
∝
√
(
T
M
)
(
v
rms
)
O
2
(
v
rms
)
H
2
=
√
[
T
O
2
T
H
2
×
M
H
2
M
O
2
]
=
√
[
(
1200
300
)
×
(
2
32
)
]
=
1
2
∴
(
v
rms
)
O
2
=
(
v
rms
)
H
2
×
1
2
=
1930
2
= 965 m/s
© examsnet.com
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