N> 04 = 2NO3, Kc = 4. This reversible reaction is studied graphically as shown in the figure. Select the correct statements:
Correct answer: D. Reaction quotient has minimum value at a point B
- A. Reaction quotient has maximum value at point A
- B. Reaction proceeds right to left at a point when [N2O4] = [NO2] = 0.1M
- C. Kc = Q when point A or C is reached
- D. Reaction quotient has minimum value at a point B
Explanation
At the start of a reaction, products are zero or very low, so Q = [products]/[reactants] is small. As the reaction proceeds, products increase and reactants decrease, so Q increases. Q reaches its maximum when the reaction nears equilibrium, depending on product/reactant ratios.
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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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