10.0s
12.5s
17.7s
32.0s
Correct answer is B
Rate of diffusion α1Density or 1√Mm
Rate = 1time
1time α1Density or 1√Molarmass
Time α√Density or √Molarmass
At constant volume of 100cm3
to2√Mno2 = tn2√1×2
504√2 = tn2√2
tn2= 12.5s
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