Close Menu
    Facebook X (Twitter) Instagram
    ScienceMotive
    • Class 9
      • Matter in Our Surroundings
      • Is Matter Around Us Pure
      • Atoms and Molecules
      • Structure of the Atom
      • The Fundamental Unit of Life
    • Class 10
      • Chapter 1: Chemical Reactions and Equations
      • Chapter 2: Acids, Bases & Salts
      • Chapter 3: Metals & Non-Metals
      • Chapter 4: Carbon and its Compounds
      • Chapter 5: Periodic Classification of Elements
      • Chapter 6: Life Processes
      • Chapter 7: Control and Coordination
      • Chapter 8: How Do Organisms Reproduce?
      • Chapter 9: Heredity and Evolution
      • Chapter 10: Light – Reflection and Refraction
      • Chapter 11: Human Eye and the Colourful World
      • Chapter 12: Electricity
      • Chapter 13: Magnetic Effects of Electric Current
      • Chapter 14: Sources of Energy
      • Chapter 15: Our Environment
      • Chapter 16: Management of Natural Resources
    • Class 11
      • Chemisrty 11
        • Chapter – 1 Some Basic Concepts of Chemistry
        • Chapter – 2 Structure Of Atom
        • Chapter – 3 Classification of Elements and Periodicity in Properties
        • Chapter – 4 Chemical Bonding and Molecular Structure
        • Chapter – 5 States of Matter
        • Chapter – 6 Thermodynamics
        • Chapter – 7 Equilibrium
        • Chapter – 8 Redox Reaction
        • Chapter – 10 s-Block Elements
        • Chapter – 13 Hydrocarbons
    • Class 12
      • Chemistry 12
        • The Solid State
        • Solutions
        • Electrochemistry
        • Chemical Kinetics
        • Surface Chemistry
        • p – Block Elements
        • d & f Block Elements
        • Coordination Compounds
        • Haloalkanes and Haloarenes
        • Alcohols, Phenols and Ethers
        • Aldehydes, Ketones and Carboxylic Acids
        • Amines
        • Biomolecules
        • Polymers
        • Chemistry in Everyday Life
    • Practice Questions
      • +1
      • +2
    • Test Series
      • Class 9 Test Series
      • Class 10 Test Series
      • Class 11 Test Series
      • Class 12 Test Series
    • World
      • Current Affairs
      • General Knowledge
    ScienceMotive
    Home » Class 11 Chemistry Case Study Questions – Chapter 1

    Class 11 Chemistry Case Study Questions – Chapter 1

    Dr. Vikas JasrotiaBy Dr. Vikas JasrotiaSeptember 30, 2022No Comments
    Share
    Facebook WhatsApp Telegram Twitter Email

    Class 11 Chemistry Case Study Questions – Chapter 1

      Class 11 Chemistry Case Study Questions

    In these questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices:
    (a) Assertion and Reason both are correct statements and Reason is the correct explanation for Assertion.
    (b) Assertion and Reason both are correct statements but Reason is not a correct explanation for Assertion.
    (c) Assertion is a correct statement but Reason is an incorrect statement.
    (d) Assertion is an incorrect statement but Reason is a correct statement.

    Read the passage given below and answer the following questions:
    Passage 1. Stoichiometry is a section of chemistry that involves a calculation based on chemical equations. Chemical equations are governed by laws of chemical combination. The mass of reactants is equal to the mass of products. The compound obtained from different methods contains the same elements in the fixed ratio by mass. A mole is a counting unit, equal to 6.022 × 1023 particles. One mole is also equal to molar mass expressed in grams. One mole of every gas at STP has a volume equal to 22.4 L. The reacting species which are consumed in the reaction completely is called limiting reagent which decides the amount of products formed.
    (i) Assertion: 22.4 L of N2 at NTP and 5.6 L of O2 at NTP contain an equal number of molecules.
    Reason: Under similar conditions of temperature and pressure, all gases contain an equal number of molecules.
    Ans (i). Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. Molar volume (at NTP) = 22.4 L
    Now 22.4 L of N2 = volume occupied by 1 mole of N2 = 28 g = 6.023 × 1023 molecules.
    Similarly, 1 mole of O2 = 2 × 16 = 32 g = 6.023 × 1023 molecules = 22.4 L
    ∴22.4 L = 6.023 × 1023 molecules

    (ii) Assertion: A reactant that is entirely consumed when a reaction goes to completion is known as a limiting reagent.
    Reason: The amount of limiting reactant limits the amount of product formed.
    Ans (ii). Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

    (iii) Assertion: Both 44 g CO2 and 16 g CH4 have the same number of carbon atoms.
    Reason: Both contain 1 g atom of carbon which contains 6.023 ×1023 carbon atoms.
    Ans (iii). Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. 44 g of CO2 =1 mole ≡1 g atom of C
    16 g of CH4 =1 mole ≡1 g atom of C
    1 g atom of C =12 g of C
    12 g of C contains 6.023 × 1023 carbon atoms.

    (iv) Assertion: As mole is the basic chemical unit, the concentration of the dissolved solute is usually specified in terms of the number of moles of solute.
    Reason: The total number of molecules of reactants involved in a balanced chemical equation is known as the molecularity of the reaction.
    Ans (iv). Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. The number of moles of a solute present in a litre of solution is known as molarity (M). The total number of molecules of reactants present in a balanced chemical equation is known as molecularity. For example,
    PCl5 → PCl3 + Cl2 (Unimolecular)
    2HI → H2 + I2 (Bimolecular)
    Therefore, molarity and molecularity are used in a different sense.

      Class 11 Chemistry Case Study Questions

    Read the passage given below and answer the following questions:
    Passage 2. Most of the reactions occurring in the laboratories are carried out in solutions. In solutions, generally, two components are present. The one which is a user in amount is called the solute and the other one which is in higher amount is called the solvent. The amount of solute present in a given quantity of solvent or solution is expressed in terms of concentration. The concentration of the solution is expressed in many ways, i.e. in mass percent, volume percent, parts per million, mole fraction, molarity, morality, and normality.
    (i) Assertion: The mass percentage of an element is used to determine the percentage composition of each element in a compound.
    Reason: Mass percentage depends on the molar mass of the compound.
    Ans (i). Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

    (ii) Assertion: The sum of the mole fraction of all the components of a solution is unity.
    Reason: Mole fraction is a temperature-dependent mode of concentration.
    Ans (ii). The assertion is correct but the Reason is incorrect.

    (iii) Assertion Molarity of a solution represents its concentration.
    Reason: Molarity is the number of moles of solute per litre of solution.
    Ans (iii). Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. Concentration means how much amount of substance solute is present in a given volume of a solution now, as the amount can be measured in terms of moles so molarity means the concentration of the solution.

    (iv) Assertion: The molality of the solution does not change with a change in temperature.
    Reason: Molality depends on the mass of the solvent.
    Ans (iv). The molality of the solution does not change with temperature as it depends on the mass and mass remains unaffected by temperature.

      Class 11 Chemistry Case Study Questions

    Advertisement
    Share. Facebook Twitter Pinterest LinkedIn Tumblr Email
    Dr. Vikas Jasrotia
    • Website

    Related Posts

    Class 11 Chemistry Half Yearly Question Paper

    September 30, 2024

    Redox Reaction

    June 13, 2024

    Equilibrium Class 11

    June 12, 2024
    Leave A Reply Cancel Reply

    READ ALSO

    Gravitation Class 9 Notes

    December 5, 2024

    Class 11 Chemistry Half Yearly Question Paper

    September 30, 2024

    Solid State Chemistry Class 12 Notes PDF Download

    September 10, 2024

    Redox Reaction

    June 13, 2024
    Class 9

    Gravitation Class 9 Notes

    By Dr. Vikas JasrotiaDecember 5, 2024

    Gravitation Class 9 Notes Gravitation Class 9 Notes Gravitation According to Newton, every object in…

    +1

    Class 11 Chemistry Half Yearly Question Paper

    By Dr. Vikas JasrotiaSeptember 30, 2024

    Class 11 Chemistry Half Yearly Question Paper Class 11 Chemistry Half Yearly Question Paper Time…

    +2

    Solid State Chemistry Class 12 Notes PDF Download

    By Dr. Vikas JasrotiaSeptember 10, 2024

    Solid State Chemistry Class 12 Notes PDF Download In our day-to-day life solids play…

    Advertisement
    Advertisement
    Facebook X (Twitter) Instagram Pinterest YouTube
    • Disclaimer
    • Contact Us
    • Privacy Policy 
    • Terms and Conditions
    © 2025 All Rights Reserved ScienceMotive.

    Type above and press Enter to search. Press Esc to cancel.