1. Tardigrade
  2. Question
  3. Chemistry
  4. Reversible reaction is studied graphically as shown in the given figure. N2O4 leftharpoons 2NO2, Kc=4 <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/23342eeaf9c9dab0a95b15561f236bc3-.jpeg /> Select the correct statements out of I, II and III. I. Reaction quotient has maximum value at point A. II. Reaction proceeds left to right at a point when [N2O4] = [NO2] =0.1 m. III. Kc=Q when point D or F is reached.

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Q. Reversible reaction is studied graphically as shown in the given figure.
$N_2O_4 \rightleftharpoons 2NO_2, K_c=4$
image
Select the correct statements out of I, II and III.
I. Reaction quotient has maximum value at point $A$.
II. Reaction proceeds left to right at a point when $[N_2O_4] = [NO_2] =0.1\, m$.
III. $K_c=Q$ when point $D$ or $F$ is reached.

Equilibrium

Solution:

I. $Q=\frac{\left[NO_{2}\right]^{2}}{\left[N_{2}O_{4}\right]}$
Since, $[NO_2]$ is minimum and $[N_2O_4]$ is maximum at point $A$, hence $Q$ is minimum at this point. Thus, false.
II. $Q=\frac{\left(0.1\right)^{2}}{\left(0.1\right)}=0.1 < K_{c}$
Thus, reaction proceeds left to right. Thus, true.
III. $K_c = Q$ when equilibrium is reached at point $D$ or $F$.
Thus, true.