2 NO\_2(g) ⇌ 2 NO(g) + O\_2(g) The above materials were sealed in a flask and allowed to come to equilibrium at a certain temperature. A small quantity of O\_2(g) was added to the flask, and the mixture was allowed to return to equilibrium at the same temperature. Which of the following has increased over its original equilibrium value?
A.
\[ \text{the quantity of }NO\_2(g) \text{ present} \]
B.
\[ \text{the quantity of }NO(g) \text{ present} \]
C.
\[ \text{the equilibrium constant, }K \]
D.
\[ \text{the rate of the reaction} \]
Exam No：AP Chemistry Problem Set 3 Year：2024 Question No：APChemistry2024AP0134
Answer:
B
Knowledge points:
7.10 Reaction Quotient and Le Châtelier’s Principle
7.6 Properties of the Equilibrium Constant
Solution:
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