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Chemistry Question on Law Of Chemical Equilibrium And Equilibrium Constant

Predict which of the following reaction will have appreciable concentration of reactants and products:

  1. Cl2(g)⇋2Cl(g): Kc=5×10–39Cl_2 (g) ⇋ 2Cl (g): \ K_c = 5×10_{–39}
  2. Cl2(g)+2NO(g)⇋2NOCl(g); Kc=3.7×108Cl_2 (g) + 2NO (g) ⇋ 2NOCl (g); \ K_c = 3.7×10^8
  3. Cl2(g)+2NO2(g)⇋2NO2Cl(g); Kc=1.8Cl_2 (g) + 2NO_2 (g) ⇋ 2NO_2Cl (g); \ K_c = 1.8
Answer

If the value of Kc lies between 10-3 and 103, a reaction has appreciable concentration of reactants and products.
Thus, the reaction given in (c) will have appreciable concentration of reactants and products.