100 mL of O2 gas diffuses in 10 s. 100 mL of gas 'X' diffuses in 't' sec. Gas 'X' and time 't' can be:-

a) H2, 2.5 s
b) SO2, 16 s
c) CO, 10 s
d) He, 4 s

If the volume of both the gases are same, then 
 t2t1=M2M1Here, t1=10 s          M1=32g           t2=t           M2=MNow, t10=M32Since two unknowns are present, we can substitute the values from the given options and then find the right answer. The option that satisfies the above equation is the right one.Substituting value of option a)t=2.5 sM=2gi.e. 2.510= 232or,14=116or, 14=14L.H.S=R.H.SHence (a) is the correct option.

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