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49. The root mean square speed of hydrogen molecules at 300 K is 1930 m/s. Then the root mean square speed of oxygen molecules at 900 K will be

(a)  1930√3 m/s                         (b) 836 m/s

(c)  643 m/s                                (d) 1930/√3 m/s

 

Answer-b

(8)

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