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Question

The temperature at which the r.m.s velocity of oxygen molecules is equal to that of nitrogen molecules at 100oC is

A
426.3 K
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B
456.3 K
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C
436.3 K
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D
446.3 K
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Solution

The correct option is A 426.3 K
Given that Vrms(O2)=Vrms(N2)

3RT1M1=3RT2M2
Where M1 is Molar mass of O2 = 32
and M2 is Molar mass of N2 = 28
thus O2 is at T1 temperature
N2 is at T2=373K temperature.
T1=M1M2×T2

T1=3228×373
T1=426.3K

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