QJEEM20Ch41cb: JEE Main 2020 Chemistry - Class 12 JEEM20Ch41cb Solution: For the reaction 2H 2 (g) + 2NO(g) N 2 (g) + 2H 2 O(g) the…

Question

Verified Solution • 2025–26 Session moderate

For the reaction
2H₂(g) + 2NO(g)

\to

N₂(g) + 2H₂O(g)
the observed rate expression is, rate = K_f[NO]²[H₂]. The rate expression for the reverse reaction is :

Accepted Answer

K_eq =

{{{k_f}} \over {{k_b}}}

=

{{\left[ {{N_2}} \right]{{\left[ {{H_2}O} \right]}^2}} \over {{{\left[ {{H_2}} \right]}^2}{{\left[ {NO} \right]}^2}}}

{k_f}\left[ {{H_2}} \right]{\left[ {NO} \right]^2} = {k_b}{{\left[ {{N_2}} \right]{{\left[ {{H_2}O} \right]}^2}} \over {\left[ {{H_2}} \right]}}

At equilibrium r_f = r_b

Given r_f =

{k_f}\left[ {{H_2}} \right]{\left[ {NO} \right]^2}

\therefore

r_b =

{k_b}{{\left[ {{N_2}} \right]{{\left[ {{H_2}O} \right]}^2}} \over {\left[ {{H_2}} \right]}}

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