Question

13. A perturbation of an equilibrium is observed to have caused additional products to form. The reaction is exothermic and has An - 2. Which of the following stresses could have caused the observation? (A) Increased Pressure (C) Removal of Product (E) None of these (B) Decreased temperature (D) Two of these

Answer 1

reactions, And for the given we have An= 2 and AH = (-) ve as it is exothermic I w An = 2 The no. of moles increases in the forward direction Moles of product y Moles of Reactant By Le Chattier's Principles which states. that if a stress is applied to a reaction mixture at equilibrium, the reaction occwis in direction that relieves the stress!"

moles of Reactant a moles of Product & Pressure of Reactant & Product Hence, if we apply stress by increasing pressure then more reactant will be formed Hence option (A) is incourect. Now, As AH = tive Hº (product) - Ho Creactame) = Ejve. g Hº (product) < Ho (xronclame) I tomperature is lowered , the reaction is shifted toward side of more heat ise _more_produck will be formed. Hence, option (B) is correct.

(c) Removal to Product Live Concentration of product is decreased As - Reaction Quotient, - Q = [Product] [ Reachant] AS [Product] is decreased more reactant is consumed to make more product , so that to achieve - Q = Kc Lequilibrium) fence, option (o) is loweet Hence, option (0) two of these is the correct answer.