In which of the following reactions will Kc = Kp? In which of the following reactions will Kc = Kp?

(A) SO3 (g) + NO (g) ↔ SO2 (g) + NO2 (g)

(B) 2 N2 (g) + O2 (g) ↔ 2 N2O (g)

(C) 4 NH3 (g) + 3 O2 (g) ↔ 2 N2 (g) + 6 H2O (g)

(D) 2 SO2 (g) + O2 (g) ↔ 2 SO3 (g)

(E) None of the above reactions have Kc = Kp.

Answer: Option A

Explanation:

Since we have a relationship between KC and KP as given below

KP=KC (RT) ^dn

dn = difference in the no of gaseous products and Reactants

For A, dn = 1+1 - (1+1) = 2-2=0

KP=KC (RT) ^0

KP=kc (1) since a^0=1

Hence KP=KC

For B, dn=2 - (2+1) = 2-3=-1, hence KP not equal to KC

For C, dn=2+6 - (4+3) = 8-7=1

For D, dn=2-3=-1, KP is not equal to KC

So option A is correct answer