Equilibrium Constant and Law of Equilibrium Quiz Online Practice Test

1. Which concept best explains the acidity of BF₃?

Arrhenius concept

Brønsted-Lowry concept

Lewis concept

Both Brønsted-Lowry and Lewis concepts

2. What is the pH of a 0.01 M solution of CH₃COOH (Ka = 1.74 x 10⁻⁵)?

3.4

3.6

3.9

3.0

3. At the halfway point of the reaction A ⇌ B, which of the following is true?

ΔG = 0

ΔG > 0

ΔG < 0

ΔG = – RT ln 2

4. At 30℃, considering water has the highest boiling point and ether has the lowest, what is the correct order of their vapor concentrations?

water > ether > acetone

water < acetone < ether

ether < acetone < water

acetone < ether < water

5. What is the pH of the solution formed by mixing equal volumes of 0.1M NaOH and 0.01M HCl?

7.0

1.04

12.05

2.0

6. Identify the species that cannot simultaneously act as a Brønsted-Lowry acid and a base:

H₂O

HCO₃⁻

HSO₄⁻

NH₂⁻

7. Which of these salts, when dissolved in water, will produce the highest pH?

KCl

NaCl

Na₂CO₃

CuSO₄

8. What is the nature of an aqueous solution of ammonium chloride (NH₄Cl)?

Alkaline

Acidic

Neutral

None of these

9. What is the pH range for an acidic solution?

pH = 7

pH < 7

pH > 7

None of these

10. What is the oxidation number of chromium in potassium chromate (K₂CrO₄)?

-6

-8

11. If the equilibrium constant (Kc) is greater than 10x, indicating that products predominate over reactants, what is the value of x?

12. If the equilibrium constant K_C is greater than 10^-3in a chemical reaction, what does this indicate?

Products are predominant

Reactants are predominant

Equilibrium

Dynamic equilibrium

13. Which symbol represents the reaction quotient?

Q_c

14. For the reaction aA + bB → cC + dD, if not at equilibrium, what is the symbol for the reaction quotient Q_c?

[A]^a[B]^b / [C]^c[D]^d

[C]^c[D]^d/ [A]^a[B]^b

[A][B] / [C][D]

[C][D] / [A][B]

15. If Q_c > K_c, what happens?

Qc decreases till equilibrium

Qc increases till equilibrium

Qc remains constant

None of these

16. At equilibrium, what relationship does K_c(equilibrium constant) have with the reaction quotient Q_c?

Greater than reaction quotient

Equal to the reaction quotient

less than the reaction question

Independent of reaction question

17. What occurs if the reaction quotient K_cis smaller than the equilibrium constant Q_c?

Equilibrium constant will change

Reaction quotient remains constant

Reaction quotient increases continuously

Reaction quotient increases till K_c

18. Given [H₂] = 0.10 M, [I₂] = 0.20 M, and [HI] = 0.40 M for the reaction H_2(g) + I_2(g) ⇌ 2HI_(g), what is the value of Q_c?

19. If the reaction quotient Q_c is 2 and the equilibrium constant K_c is 3, what can be inferred about the reaction?

The equilibrium constant will increase

The equilibrium constant will decrease

The equilibrium constant remains unchanged

The reaction quotient will increase

20. At a given temperature, the equilibrium constant for different chemical reactions is:

Constant

Unique

The same

Cannot be determined

Test Name:	Equilibrium Constant and Law of Equilibrium
Subject Category:	Chemistry
Test Type:	Multiple Choice Questions
Total Score / Questions:	20 / 20
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

Equilibrium Constant and Law of Equilibrium Quiz Online Practice Test

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