Question

In which one of the following gaseous equilibria $K _ { p }$ is less than $K _ { c }$.

• A. ⇌ $2 \mathrm { NO } _ { 2 }$
• B. ⇌
• C. ⇌ $2 \mathrm { SO } _ { 3 }$
• D. $N _ { 2 } + O _ { 2 }$ ⇌

Answer 1

Answer: (C)

⇌ $2 \mathrm { SO } _ { 3 }$

Answer 2

$K _ { p } = K _ { c } ( R T ) ^ { \Delta n }$

$\Delta n = - 1$for reaction $2 \mathrm { SO } _ { 2 } + \mathrm { O } _ { 2 }$ ⇌ $2 \mathrm { SO } _ { 3 }$

So for this reaction $K _ { p }$is less than $K _ { c }$.