Question

10. Nitric oxide gas at 2.0 atm. and oxygen gas at 1 atm are injected simultaneously through pinhole of identical
area of cross section at the opposite end of a circular glass tube. The length of tube is 1.0 m and gases are
kept at same temperature. Determine the distance from 0, end at which first flash of brown fume would be
observed
(2) 0.33 m
(1) 0.11 m
(3) 0.85 m
(4) 0.67 m​

Answer 1

$</p><p>\frac{d1}{t1} \times \frac{t2}{d2} = \sqrt{ \frac{m2}{m1} }\times \frac{p1}{p2}$

& t1 = t2

given,

m1 = 14+16= 30 , m2= 16, p1=2 atm ,p2=1 atm

let = a, d2= (1-a) [as length of tube is 1.0 m]

$\frac{a}{1 - a} = \sqrt{ \frac{16}{30} }\times \frac{2}{1}$

so , a≈ 0.59359

1-a≈0.4 ≈ 0.33 m( opt.2)

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