Chemical Equilibrium Class 11 MCQ Quiz With Answers

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Chemical Equilibrium Class 11 MCQ Quiz With Answers - Quiz

If you're studying in class 11 and looking for a chemical equilibrium MCQ quiz, then look nowhere else. Here, we have come up with an interesting quiz that consists of equilibrium questions and answers from the latest exam pattern. So, play it out and test your understanding. Chemical equilibrium is a state in a chemical reaction where no net change in the concentration of reactants and products occurs. How much more do you know? Learn more about it with the following quiz. Good luck!


Questions and Answers
  • 1. 

    Reaction from which we can get back the reactants form products is called 

    • A.

      Irreversible reaction

    • B.

      Reversible reaction

    • C.

      Endothermic reaction 

    • D.

      Exothermic reaction

    Correct Answer
    B. Reversible reaction
    Explanation
    A reversible reaction is a reaction that can proceed in both the forward and reverse directions. This means that the products can react together to form the reactants again. In other words, the reaction is not completed in one direction only, but can be reversed. This is in contrast to an irreversible reaction, where the reaction proceeds only in one direction and cannot be reversed. Therefore, a reversible reaction is the correct answer because it describes a reaction that can go back to the reactants from products.

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  • 2. 

    The solubility of Ca3​(PO4​​)2​ in water is y mol/L. The solubility product will be

    • A.

      36 y4

    • B.

      6y²

    • C.

      108 y5

    • D.

      64 y5

    Correct Answer
    C. 108 y5
    Explanation
    The solubility product (Ksp) is a measure of the equilibrium concentration of the ions in a saturated solution. For the compound Ca3(PO4)2, it dissociates into 3 Ca2+ ions and 2 PO4 3- ions. The solubility of Ca3(PO4)2 in water is y mol/L, which means that the concentration of Ca2+ ions and PO4 3- ions in the saturated solution is also y mol/L. The solubility product is calculated by multiplying the concentrations of the ions raised to their stoichiometric coefficients. In this case, (y^3)(y^2) = y^5, so the correct answer is 108 y5.

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  • 3. 

    What is an acid according to Lewis concept?

    • A.

      Electron pair acceptor

    • B.

      Proton acceptor

    • C.

      Electron pair donor

    • D.

      Proton donor

    Correct Answer
    A. Electron pair acceptor
    Explanation
    According to the Lewis concept, an acid is defined as an electron pair acceptor. In this concept, acids are substances that can accept a pair of electrons to form a covalent bond. This is in contrast to the traditional definition of an acid as a proton donor. The Lewis concept expands the understanding of acids to include substances that can accept electrons, not just donate protons.

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  • 4. 

    The pH of a solution of hydrochloric acid is 4. What is the molarity of the solution?

    • A.

      0.4

    • B.

      0.0001

    • C.

      0.04

    • D.

      4.0

    Correct Answer
    B. 0.0001
    Explanation
    The molarity of a solution is a measure of the concentration of a solute in a solution. In this case, the pH of the solution is given as 4, which indicates that the concentration of H+ ions in the solution is 10^-4 M. Since hydrochloric acid (HCl) is a strong acid that dissociates completely in water, the concentration of HCl in the solution is also 10^-4 M. Therefore, the molarity of the solution is 0.0001 M.

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  • 5. 

    Strong conjugate base is out of these following:

    • A.

      Cl

    • B.

      NO32-

    • C.

      CH3COO

    • D.

      SO42-

    Correct Answer
    C. CH3COO
    Explanation
    The correct answer is CH3COO-, which is the conjugate base of acetic acid (CH3COOH). Acetic acid is a weak acid, meaning it only partially dissociates in water to form its conjugate base and a hydronium ion. The conjugate base of a weak acid is typically a weak base, and in this case, CH3COO- is a weak base. Therefore, CH3COO- is the strong conjugate base among the given options.

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  • 6. 

    The weakest base out of the following is:

    • A.

      Ca(OH)2

    • B.

      KOH

    • C.

      NH4OH

    • D.

      NaOH

    Correct Answer
    C. NH4OH
    Explanation
    NH4OH is the weakest base out of the given options because it is formed by the weak base ammonia (NH3) reacting with water (H2O). Ammonia is a weak base because it does not completely dissociate into hydroxide ions (OH-) in water. Instead, it forms a small amount of NH4+ and OH- ions. Therefore, NH4OH has a lower concentration of hydroxide ions compared to the other options, making it the weakest base.

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  • 7. 

    The colour change when copper sulphate is heated is 

    • A.

      Blue to white

    • B.

      White to blue

    • C.

      Blue to pink 

    • D.

      Pink to blue

    Correct Answer
    A. Blue to white
    Explanation
    When copper sulphate is heated, it undergoes a chemical reaction called thermal decomposition. During this reaction, the blue copper sulphate crystals lose water molecules and turn into anhydrous copper sulphate, which is white in color. Therefore, the color change observed when copper sulphate is heated is from blue to white.

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  • 8. 

    Adding water to anhydrous copper sulphate is a ...............change

    • A.

      Endothermic

    • B.

      Exothermic

    • C.

      Both

    • D.

      None

    Correct Answer
    B. Exothermic
    Explanation
    When water is added to anhydrous copper sulphate, a chemical reaction takes place where the anhydrous copper sulphate combines with water molecules to form hydrated copper sulphate. This reaction releases energy in the form of heat, making it an exothermic change.

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  • 9. 

    During a chemical equilibrium, which of the following statements is correct?

    • A.

      The rate of the forward reaction is greater than the backward reaction.

    • B.

      The rate of the backward reaction is greater than the forward reaction.

    • C.

      Both the forward and backward reactions occur at the same rate.

    • D.

      The rates of the forward and backward reactions are different.

    Correct Answer
    C. Both the forward and backward reactions occur at the same rate.
    Explanation
    In a state of chemical equilibrium, the rate of the forward reaction equals the rate of the backward reaction. This balance of rates means that the concentrations of the reactants and products remain constant over time, even though the reactions continue to occur.

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  • 10. 

    The amount of reactant and product remain .................during equilibrium

    • A.

      Equal

    • B.

      Constant 

    • C.

      Different 

    • D.

      Semi different

    Correct Answer
    B. Constant 
    Explanation
    During equilibrium, the amount of reactant and product remains constant. This is because the forward and reverse reactions occur at the same rate, resulting in a dynamic balance between the reactants and products. While the concentrations of reactants and products may change, the overall amount of each remains constant.

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  • Feb 01, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • May 18, 2022
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    Themes
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