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3. At a certain temperature, the m.s. velocity for

O2 is 400 m/sec. At the same temperature, the r.m.s. velocity for H2 molecules will be

(a)  100 m/sec                                 (b)  25 m/sec

(c)   1600 m/sec                             (d)  6400 m/sec

Answer-c

(4)

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