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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :4 mins
    πŸ”„Ncert Concepts :Mole Concept, Avogadro's Law, Stoichiometry

    Related Questions

    1.

    If you have 2 g of each of the following substances, which one would contain the highest number of atoms?

    A

    Helium

    B

    Neon

    C

    Argon

    D

    Krypton

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2020
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Mole Concept, Atomic Mass

    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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :atomic structure, ions, protons, electrons

    3.

    Maximum no. of atoms are present in

    A

    8g CH48g\,C{H_4}

    B

    8g C6H12O68g\,{C_6}{H_{12}}{O_6}

    C

    25g CaCO325g\,CaC{O_3}

    D

    28g CO28g\,CO

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :molar mass, moles, Avogadro's number, number of atoms in a molecule

    4.

    The molar mass of oxygen atoms is 16 g/mol. What is the mass of 0.25 moles of oxygen atoms?

    A

    2g

    B

    4g

    C

    8g

    D

    16g

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Mole Concept, Molar Mass

    5.

    Which one of the followings has maximum number of atoms ?

    A

    1  g{\rm{1}}\,\,{\rm{g}}of Ag (s){\rm{Ag}}\,\left( {\rm{s}} \right) [ Atomic mass of Ag=108Ag = {\rm{ }}108 ]

    B

    1  g{\rm{1}}\,\,{\rm{g}} of Mg (s){\rm{Mg}}\,\left( {\rm{s}} \right) [ Atomic mass of Mg=24Mg = {\rm{ }}24 ]

    C

    1  g{\rm{1}}\,\,{\rm{g}} of O2(g){{\rm{O}}_{\rm{2}}}\left( {\rm{g}} \right) [ Atomic mass of O=16O = {\rm{ 16}} ]

    D

    1  g{\rm{1}}\,\,{\rm{g}} of Li (s){\rm{Li}}\,\left( {\rm{s}} \right) [ Atomic mass of Li=7Li = {\rm{ 7}} ]

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Moles, Atomic Mass, Number of Atoms

    6.

    Which gas contains larger number of molecules?

    A

    4gβ€…β€Šofβ€Šβ€…β€ŠH2O4{\rm{g}}\;{\rm{of}}{\mkern 1mu} \;{{\rm{H}}_2}{\rm{O}}

    B

    2gβ€…β€Šofβ€…β€Šmarshβ€…β€Šgas2{\rm{g}}\;{\rm{of}}\;{\rm{marsh}}\;{\rm{gas}}

    C

    4{\rm{g}}\;{\rm{of}}{\mkern 1mu}  \;{\rm{PC}}{{\rm{l}}_5}

    D

    2gβ€…β€Šofβ€…β€Šphosgene2{\rm{g}}\;{\rm{of}}\;{\rm{phosgene}}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :moles, molar mass, Avogadro's number

    7.

    The relation between molecular weight (M)\left( M \right) and vapour density (VD)\left( VD \right) is:

    A

    M=2.5imesVDM = 2.5 imes {\rm{VD}}

    B

    M=2imesVDM = 2 imes {\rm{VD}}

    C

    M=0.5imesVDM = 0.5 imes {\rm{VD}}

    D

    M=VDM = {\rm{VD}}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Molecular weight, Vapour density

    8.

    How many moles are present in 18g of water (H2O)?

    A

    1 mol

    B

    0.5 mol

    C

    2 mol

    D

    18 mol

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Mole Concept, Molar Mass

    9.

    What is the mass of one mole of carbon dioxide (CO2)?

    A

    12g

    B

    22g

    C

    44g

    D

    66g

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Mole Concept, Molar Mass

    10.

    Which one of the followings has maximum number of atoms ?

    A

    1  g{\rm{1}}\,\,{\rm{g}}of Ag (s){\rm{Ag}}\,\left( {\rm{s}} \right) [ Atomic mass of Ag=108Ag = {\rm{ }}108 ]

    B

    1  g{\rm{1}}\,\,{\rm{g}} of Mg (s){\rm{Mg}}\,\left( {\rm{s}} \right) [ Atomic mass of Mg=24Mg = {\rm{ }}24 ]

    C

    1  g{\rm{1}}\,\,{\rm{g}} of O2(g){{\rm{O}}_{\rm{2}}}\left( {\rm{g}} \right) [ Atomic mass of O=16O = {\rm{ 16}} ]

    D

    1  g{\rm{1}}\,\,{\rm{g}} of Li (s){\rm{Li}}\,\left( {\rm{s}} \right) [ Atomic mass of Li=7Li = {\rm{ 7}} ]

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Moles, Atomic mass, Number of atoms

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