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1. If the molecular weight of two gases are M1 and M1, then at a temperature the ratio of root mean square velocity v1 and v2 will be

(a) √M1/M2                                              (b) √M2/M1

(c) √(M1+M2)/(M1-M2 )                        (d) √(M1-M2)/(M1+M2 )

Answer-b

(10)

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