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NEET · Chemistry · STD 11 - 6.1. Equilibrium - 1 (chemical Equilibrium)

Given below are certain reactions. Identify the reaction for which \(K_p \neq K_c:\)

  1. A \(H _2 O ( g )+ CO ( g ) \rightleftharpoons H _2(g)+ CO _2(g)\)
  2. B \(N _2(g)+3 H _2(g) \rightleftharpoons 2 NH _3(g)\)
  3. C \(H _2(g)+ I _2(g) \rightleftharpoons 2 HI ( g )\)
  4. D \(N_2(g)+ O _2(g) \rightleftharpoons 2 NO ( g )\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(N _2(g)+3 H _2(g) \rightleftharpoons 2 NH _3(g)\)

Step-by-step Solution

Detailed explanation

(B) The relation between \(K_p\) and \(K_c\) is given by \(K_p=K_c(R T)^{\Delta n_g}\), where \(\Delta n_g\) is the difference between the number of moles of gaseous products and gaseous reactants.
For \(K_p \neq K_c, \Delta n_g\) must be non-zero.
For \(H _2 O ( g )+ CO ( g ) \rightleftharpoons H _2(g)+ CO _2(g), \Delta n_g=2-2=0 \Rightarrow K_p=K_c\)
For \(N _2(g)+3 H _2(g) \rightleftharpoons 2 NH _3(g), \Delta n_g=2-4=-2 \Rightarrow K_p \neq K_c\)
For \(H _2(g)+ I _2(g) \rightleftharpoons 2 HI ( g ), \Delta n_g=2-2=0 \Rightarrow K_p=K_c\)
For \(N _2(g)+ O _2(g) \rightleftharpoons 2 NO ( g ), \Delta n_g=2-2=0 \Rightarrow K_p=K_c\)