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Q.

If the r. m s speed of chlorine molecule is 490 m/s at 27°C, the r.m.s speed of argon molecules at the same temperature will be (Atomic mass of argon=39.9 u, molecular mass of chlorine=70.9 u)

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a

451.7 m/s

b

551.7 m/s

c

651.7 m/s 

d

751.7 m/s 

answer is C.

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Detailed Solution

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vrms=3RTM⇒v1v2=M2M1 490v2==39.970.9=0.75⇒v2=651.7 ms-1

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