Chemical and Ionic Equilibrium - Result Question 112

####56. The incorrect statement among the following for this reaction, is

(2016 Adv.)

(a) Decrease in the total pressure will result in the formation of more moles of gaseous X

(b) At the start of the reaction, dissociation of gaseous X2 takes place spontaneously

(c) βequilibrium =0.7

(d) KC<1

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Solution:

  1. (a)

Kp=4px2(4x2)=px2

x1p

(4»>x)

If p decreases, x increases. Equilibrium is shifted in the forward side. Thus, statement (a) is correct.

(b) At the start of the reaction, Q=0 where, Q is the reaction quotient ΔG=ΔG+2.303RTlogQ

Since, ΔG>0, thus ΔG is ve.

Hence, dissociation takes place spontaneously.

Thus, (b) is correct.

(c) If we use x=0.7 and p=2 bar then Kp=4×2(0.7)2[4(0.7)2]

Thus, (c) is incorrect.

=1.16>1

(d) At equilibrium, ΔG=0

ΔG=2.303RTlogKp  Since, ΔG=+ ve 

Hence, Kp<1

KC=Kp(RT)

Then KC<1. Thus, (d) is correct.

Topic 2 lonic Equilibrium

Al(OH)3 Al3+ +3OH
Initiall 1 0 0
At equilibrium 1S S 3S+0.2


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