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Q.

At 1000 K, a sample of pure NO, gas decomposes as :2NO2(g)⇌2NO(g)+O2(g) The equilibrium constant K p is 156.25 atm. Analysis shows that the partial pressure of O2 is 0.25atm at equilibrium. The partial pressure of NO2, at equilibrium is :

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a

0.01

b

0.02

c

0.04

d

None of these

answer is B.

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Detailed Solution

Let P is initial pressure of NO2            2NO2(g)⇌2NO(g)+O2(g) at eq.; P-2x          2x         x  as per given x=0.25 Kp=(2x)2(x)(P-2x)2 ⇒ 156.25=(0.5)2(0.25)PNO22 PNO2=0.02
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