This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 7 Equilibrium – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Removing a reactant causes the reaction to shift in which direction (reactants + reagents $\rightarrow$ products) A) Left. B) Right. C) It doesnt. D) None of the above. Show Answer Correct Answer: A) Left. 2. Which factors increase the rate of a reaction. A) Increasing temperature. B) Increasing concentration. C) Increasing surface area. D) All of these. Show Answer Correct Answer: D) All of these. 3. In a laboratory experiment, a student adds a small amount of sodium chloride to a saturated solution of sodium chloride. What is the expected observation? A) The solution becomes unsaturated. B) The solution remains unchanged. C) Sodium chloride precipitates out of the solution. D) The solubility of sodium chloride increases. Show Answer Correct Answer: C) Sodium chloride precipitates out of the solution. 4. What factor can be increased to provide more collisions for gases only? A) Temperature. B) Surface area. C) Pressure. D) Adding a catalyst. Show Answer Correct Answer: C) Pressure. 5. In a population of bears, the frequency of q is 0.44. What is the frequency of p? A) 0.1936. B) 0.44. C) 0.56. D) 0.22. Show Answer Correct Answer: C) 0.56. 6. A thin 1 m long rod has a 200 g object attached to the left end and a 300 g object attached to the right end. If the pivot point is in the middle of the rod, the object ..... A) Will be in static rotational equilibrium. B) Will have a positive angular position. C) Will have a negative angular position. D) Is balanced. Show Answer Correct Answer: C) Will have a negative angular position. 7. What happens to the position of equilibrium when the concentration of a reactant is increased? A) The equilibrium shifts to the right. B) The equilibrium shifts to the left. C) The equilibrium remains unchanged. D) The reaction stops. Show Answer Correct Answer: A) The equilibrium shifts to the right. 8. In a chemical equilibrium, what happens to the concentrations of reactants and products when a catalyst is added? A) The concentrations of reactants and products remain unchanged. B) The concentration of reactants increases. C) The concentration of products increases. D) Both reactants and products are consumed. Show Answer Correct Answer: A) The concentrations of reactants and products remain unchanged. 9. In the reaction @@ext\{N\} ..... 2(g) + 3ext\{H\} ..... 2(g) ightleftharpoons 2ext\{NH\} ..... 3(g)@@, what happens to the equilibrium position if the pressure is increased? A) Shifts to the right, favoring the formation of $\text{NH}_3$. B) Shifts to the left, favoring the formation of $\text{N}_2$ $\text{H}_2$. C) Remains unchanged. D) The reaction stops. Show Answer Correct Answer: A) Shifts to the right, favoring the formation of $\text{NH}_3$. 10. Higher indifference curve represents A) Lower level of satisfaction. B) Medium level of satisfaction. C) No satisfaction. D) Higher level of satisfaction. Show Answer Correct Answer: D) Higher level of satisfaction. 11. For equilibrium to occur ..... A) The reactants must be in an open system. B) The reactants must be in a closed system. C) The reactants can be in either a closed or open system. D) None of the above. Show Answer Correct Answer: B) The reactants must be in a closed system. 12. Which of the following does not affect the position of equilibrium? A) Temperature. B) Pressure. C) Particle Size. D) Concentration. Show Answer Correct Answer: C) Particle Size. 13. Neutral equilibrium A) A kind of equilibrium so that with a small or insignificant change, it still remains in a state of equilibrium. B) A kind of equilibrium so that when the object is slightly changed, it go further from its original position. C) A kind of equilibrium so that with a small change, forces emerge which help return the object back into a state of equilibrium. D) None. Show Answer Correct Answer: A) A kind of equilibrium so that with a small or insignificant change, it still remains in a state of equilibrium. 14. What happens to the concentrations of the reactants and products at equilibrium? A) They increase. B) They decrease. C) They remain constant. D) They become zero. Show Answer Correct Answer: C) They remain constant. 15. What is true for catalyst in a chemical reaction? A) It impacts the equilibrium constant. B) It disturbs the equilibrium composition. C) It helps to attain the equilibrium faster. D) None of the above. Show Answer Correct Answer: C) It helps to attain the equilibrium faster. 16. Equilibria in which all substances are in the same phases are called A) Dynamic equilibrium. B) Equilibrium constant. C) Homogeneous equilibria. D) Heterogeneous equilibria. Show Answer Correct Answer: C) Homogeneous equilibria. 17. A chemical equilibrium exists when: A) Reactants are completely changed to products. B) There are equal amounts of reactants and products. C) The rate at which reactants form products becomes zero. D) The rate at which reactants form products is the same as the rate at which products form reactants. Show Answer Correct Answer: D) The rate at which reactants form products is the same as the rate at which products form reactants. 18. PKa values of two acids A and B are 4 and 5. The strengths of these two acids are related as A) Acid A is 10 times stronger than acids B. B) The strengths of the two acids can not be compared. C) Acid B is 10 times stronger than acid A. D) Strength of acid A:strengtha of acid B = 4:5. Show Answer Correct Answer: A) Acid A is 10 times stronger than acids B. 19. The partial pressures in a system always add up to: A) 100. B) The total pressure. C) 1. D) 0. Show Answer Correct Answer: B) The total pressure. 20. Equilibrium is a ..... process A) Static. B) Dynamic. C) Probabilistic. D) Fictitious. Show Answer Correct Answer: B) Dynamic. 21. TRUE or FALSE: "At equilibrium, the RATES of the forward and reverse reactions are EQUAL" A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. Which is the correct equilibrium constant expression for the following reaction? Fe$_{2}$O$_{3(s)}$ + 3H$_{2(g)}$ $\rightarrow$ 2Fe$_{(s)}$ + 3H$_{2}$O$_{(g)}$ A) K = [H$_{2}$O]3 / [H$_{2}$]$^{3}$. B) K = [Fe$_{2}$O$_{3}$] [H$_{2}$]$^{3}$ / [Fe]$^{2}$[H$_{2}$O]$^{3 }$. C) K = [Fe]$^{2}$[H$_{2}$O]$^{3}$ / [Fe$_{2 }$O$_{3}$] [H$_{2}$]$^{3}$. D) K= [Fe] [H$_{2}$O] / [Fe$_{2}$O$_{3}$] [H$_{2}$]. E) K = [H$_{2}$] / [H$_{2}$O]. Show Answer Correct Answer: A) K = [H$_{2}$O]3 / [H$_{2}$]$^{3}$. 23. A population's recessive allele frequency 25%. What is the percentage of the Heterozygous genotype? A) .5625. B) .3750. C) .0625. D) .25. E) .5. Show Answer Correct Answer: B) .3750. 24. Which of the following statements is true about the equilibrium constant (K) for a chemical reaction? A) K is always greater than 1 for all reactions. B) K is independent of temperature. C) K is a measure of the extent of a reaction at equilibrium. D) K is always less than 1 for all reactions. Show Answer Correct Answer: C) K is a measure of the extent of a reaction at equilibrium. 25. Which description below best describes what is happening when a reversible reaction has reached equilibrium? A) There are no more reactants left and only products are present. B) No reactants are combining anymore and no products are being produced. C) Reactants are still combining to form products but the products are forming reactants at the same rate. D) No reactants are combining anymore and products are now breaking apart to make more reactants. Show Answer Correct Answer: C) Reactants are still combining to form products but the products are forming reactants at the same rate. ← PreviousNext →Related QuizzesClass 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 1Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 2Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 3Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 4Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 5Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 6Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 8Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 9Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 10Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books