Q. What is the effect of adding an inert gas at constant volume on the equilibrium position?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase the rate of reaction
Solution
Adding an inert gas at constant volume does not change the partial pressures of the reactants and products, so the equilibrium position remains unchanged.
Q. What is the effect of dilution on the pH of a weak acid solution?
A.
pH decreases
B.
pH increases
C.
pH remains constant
D.
pH becomes neutral
Solution
Dilution of a weak acid decreases its concentration, which shifts the equilibrium to the right, increasing the concentration of H+ ions and thus increasing the pH.
Q. What is the equilibrium constant expression for the reaction: aA + bB ⇌ cC + dD?
A.
K = [C]^c [D]^d / [A]^a [B]^b
B.
K = [A]^a [B]^b / [C]^c [D]^d
C.
K = [C]^c [D]^d
D.
K = [A]^a [B]^b
Solution
The equilibrium constant K is defined as the ratio of the concentration of products to the concentration of reactants, each raised to the power of their coefficients in the balanced equation.
Q. What is the pH of a 0.01 M solution of sodium acetate (CH3COONa)?
A.
4.76
B.
7.00
C.
9.24
D.
10.00
Solution
Sodium acetate is a salt of a weak acid (acetic acid) and a strong base (sodium hydroxide). The pH can be calculated using the formula pH = 7 + 0.5(pKa - log[C]), where pKa of acetic acid is 4.76.
Understanding the concept of "Equilibrium" is crucial for students preparing for school exams and competitive tests. This topic not only forms a significant part of the syllabus but also appears frequently in various examinations. Practicing MCQs and objective questions on Equilibrium helps students grasp the core concepts, ensuring better scores and enhanced exam preparation.
What You Will Practise Here
Definition and types of equilibrium: static, dynamic, and chemical equilibrium.
Key concepts related to Le Chatelier's principle and its applications.
Equilibrium constant (K) and its significance in chemical reactions.
Factors affecting equilibrium: concentration, temperature, and pressure.
Equilibrium calculations and problem-solving techniques.
Common diagrams illustrating equilibrium states and shifts.
Important formulas related to equilibrium and their derivations.
Exam Relevance
The topic of Equilibrium is highly relevant in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of equilibrium concepts, often presented in the form of MCQs. Common question patterns include identifying shifts in equilibrium, calculating equilibrium constants, and applying Le Chatelier's principle to different scenarios.
Common Mistakes Students Make
Confusing static and dynamic equilibrium, leading to incorrect interpretations.
Misunderstanding the application of Le Chatelier's principle in different contexts.
Overlooking the significance of temperature and pressure changes on equilibrium.
Failing to accurately calculate equilibrium constants due to formula misapplication.
FAQs
Question: What are the main types of equilibrium? Answer: The main types of equilibrium include static equilibrium, dynamic equilibrium, and chemical equilibrium.
Question: How does temperature affect equilibrium? Answer: Changes in temperature can shift the position of equilibrium, favoring either the forward or reverse reaction depending on whether the reaction is exothermic or endothermic.
Now is the time to strengthen your understanding of Equilibrium! Dive into our practice MCQs and test your knowledge to excel in your exams. Every question solved brings you one step closer to mastering this essential topic!
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