By increasing temperature in ammonia synthesis, the value of Kc?
Correct answer: A. Decreases
- A. Decreases
- B. Increases
- C. Remains constant
- D. None of these options are correct
Explanation
The synthesis of ammonia is carried out at 400 to 450o C (optimum temperature) in the presence of finely divided iron which acts as a catalyst and a high pressure of 200-500 atm.The formation of ammonia from its elements is an exothermic reaction, and its reverse reaction is endothermic.Thus, the increase in temperature results in the increased dissociation of ammonia (endothermic reaction). Hence, the value of Kc decreases with an increase in temperature.Hence, A is the correct option.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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