For the reaction aligned & 2 NO_ 2(~g) leftharpoons2 NO_ (g) +O_ 2(~g) , & (K_ c =1.8 ×10^ -6 at 184 C) & (R=0.0831 ~kJ/(mol . K) aligned When K_ p and K_ c are compared at 184^ ^ C , it is found that

Correct answer: A. K_ p is greater than K_ c Kp=Kc RT ^ Δ n , Δ n= 1 Kp > Kc

JEE Main 2005

JEE Main 2005 · Chemistry · Chemical Equilibrium

For the reaction aligned & 2 NO_ 2(~g) leftharpoons2 NO_ (g) +O_...

For the reaction

\begin{aligned}& 2 \mathrm{NO}_{2(\mathrm{~g})} \rightleftharpoons2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})} \text{, }\\ & \left(\mathrm{K}_{\mathrm{c}}=1.8 \times10^{-6} \text{at }184 \mathrm{C}\right)\\ & (\mathrm{R}=0.0831 \mathrm{~kJ}/(\mathrm{mol} . \mathrm{K}) \end{aligned}

When

\mathrm{K}_{\mathrm{p}}

and

\mathrm{K}_{\mathrm{c}}

are compared at

184^{{}^{\circ}} \mathrm{C}

, it is found that

A $\mathrm{K}_{\mathrm{p}}$ is greater than $\mathrm{K}_{\mathrm{c}}$
B $\mathrm{K}_{\mathrm{p}}$ is less than $\mathrm{K}_{\mathrm{c}}$
C $\mathrm{K}_{\mathrm{p}}=\mathrm{K}_{\mathrm{c}}$
DWhether $\mathrm{K}_{\mathrm{p}}$ is greater than, less than or equal to $\mathrm{K}_{\mathrm{c}}$ depends upon the total gas pressure

A. $\mathrm{K}_{\mathrm{p}}$ is greater than $\mathrm{K}_{\mathrm{c}}$

\mathrm{Kp}=\mathrm{Kc} \mathrm{RT} ^{\Delta n}, \quad \Delta \mathrm{n}=

\mathrm{Kp}

\mathrm{Kc}