Verified Solution • 2025–26 Session moderate

QJEEM05Ch07f5: JEE Main 2005 Chemistry - Class 11 JEEM05Ch07f5 Solution: For the reaction 2NO 2 (g) 2NO (g) + O 2 (g), (K c = 1.8 10 -6…

For the reaction 2NO2 (g) ⇋\leftrightharpoons 2NO (g) + O2 (g), (Kc = 1.8 ×\times 10-6 at 184oC) (R = 0.0831 kJ/(mol. K))
When Kp and Kc are compared at 184oC , it is found that :

Multiple Choice Options

  • A Kp is greater than Kc
  • B Kp is less than Kc
  • C Kp = Kc
  • D Whether Kp is greater than, less than or equal to Kc depends upon the total gas pressure

Step-by-Step Verified Solution

For the reaction : -

2NO2(g)⇌2NO(g)+O2(g)2N{O_2}\left( g \right)\rightleftharpoons2NO\left( g \right) + {O_2}\left( g \right)

Given Kc=1.8×10−6  {K_c} = 1.8 \times {10^{ - 6}}\,\, at   184∘C\,\,{184^ \circ }C

R=0.0831R=0.0831   kJ/mol.k\,\,kJ/mol.k

Kp=1.8×10−6×0.0831×457{K_p} = 1.8 \times {10^{ - 6}} \times 0.0831 \times 457

=6.836×10−6= 6.836 \times {10^{ - 6}}

[\left[ {} \right. as      184∘C=(273+184)=457 k,  \,\,\,\,\,{184^ \circ }C = \left( {273 + 184} \right) = 457\,k,\,\,

              Δn=(2+1,−1)=1]\,\,\,\,\,\,\,\,\,\,\,\,\,\,\left. {\Delta n = \left( {2 + 1, - 1} \right) = 1} \right]

Hence it is clear that {K_p} > {K_c}

Related Learning Resources & Exam Preparation