1.

    A 20 L vessel contains 0.1 mole of O2O_2 at 300 K. O3O_3 is prepared in the vessel by subjecting O2O_2 to silent electric discharge till the volume is reduced to 15 L at 300K. What is the number of moles of O3O_3 formed?

    A

    0.05

    B

    0.025

    C

    0.075

    D

    0.01

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :4 mins
    🔄Ncert Concepts :Mole Concept, Avogadro's Law, Stoichiometry

    Related Questions

    1.

    Which of the following contains the maximum number of water molecules?

    A

    18 moles of water

    B

    18 molecules of water

    C

    18 grams of water

    D

    18 g of O2O_2

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Mole Concept, Avogadro's Number

    2.

    Oxygen and the oxide ion have the

    A

    Same proton number

    B

    Same electronic configuration

    C

    Same electron number

    D

    Same size

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :atomic structure, ions, protons, electrons

    3.

    Oxygen and the oxide ion have the

    A

    Same proton number

    B

    Same electronic configuration

    C

    Same electron number

    D

    Same size

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :atomic structure, ions, protons, electrons

    4.

    According to the Haber-Bosch process, the molar ratio of hydrogen to ammonia is:

    A

    1:1

    B

    2:1

    C

    3:2

    D

    1:2

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2019
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Stoichiometry, Haber-Bosch process, Mole concept

    5.

    If Avogadro number, NAN_A, is changed from 6.022imes1023 mol−16.022 imes 10^{23} \, mol^{-1} to 6.022imes1020 mol−16.022 imes 10^{20} \, mol^{-1}, this would change:

    A

    The definition of mass of 1 mole of substance

    B

    The mass of one molecule of a substance

    C

    The ratio of the mass of a molecule to the mass of an atom

    D

    The mass of one mole of a substance

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Mole Concept, Avogadro's Number

    6.

    One mole of   CO2\;{\rm{C}}{{\rm{O}}_2} contains:

    A

    6.02imes1023atoms  of  C6.02 imes {10^{23}}{\rm{atoms}}\;{\rm{of}}\;{\rm{C}}

    B

    6.02imes1023atoms  of  O6.02 imes {10^{23}}{\rm{atoms}}\;{\rm{of}}\;{\rm{O}}

    C

    3.01imes1023molecules  of  CO23.01 imes {10^{23}}molecules\;of\;C{O_2}

    D

    None of the above

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :mole concept, Avogadro's number, chemical formula

    7.

    If Avogadro's number were redefined as 6.022imes1026 mol−16.022 imes 10^{26} \, mol^{-1}, which of the following would be directly affected?

    A

    The mass of one molecule of oxygen

    B

    The ratio of the mass of an oxygen molecule to the mass of an oxygen atom

    C

    The mass of one mole of oxygen

    D

    The definition of 1 mole

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Mole Concept, Avogadro's Number

    8.

    One mole of   CO2\;{\rm{C}}{{\rm{O}}_2} contains:

    A

    6.02imes1023atoms  of  C6.02 imes {10^{23}}{\rm{atoms}}\;{\rm{of}}\;{\rm{C}}

    B

    6.02imes1023atoms  of  O6.02 imes {10^{23}}{\rm{atoms}}\;{\rm{of}}\;{\rm{O}}

    C

    3.01imes1023molecules  of  CO23.01 imes {10^{23}}molecules\;of\;C{O_2}

    D

    None of the above

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :mole concept, Avogadro's number, chemical formula

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