1.

    A mixture of CaCO3CaCO_3 and MgCO3MgCO_3 weighing 1.84 g on heating leaves a residue weighing 0.96 g. If the percentage by mass of CaCO3CaCO_3 in the original mixture is x%, what is the value of x/2?

    A

    27.18

    B

    32.50

    C

    41.25

    D

    54.35

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Mole Concept, Stoichiometry, Percentage Composition

    Related Questions

    1.

    In which case the number of molecules of water maximum

    A

    18 ml of water

    B

    0.18 g of water

    C

    0.00224 L of water vapour at 1 atm and 273 K

    D

    10βˆ’3{10^{ - 3}} mol of water

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

    2.

    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

    3.

    The total number of electrons in 18 ml of water (density = 1/gml

    A

    6.023  imes  10256.023\,\, imes \,\,{10^{^{25}}}

    B

    6.023  imes  10246.023\,\, imes \,\,{10^{^{24}}}

    C

    6.023  imes 18  imes  10236.023\,\, imes \,18\,\, imes \,\,{10^{^{23}}}

    D

    6.023  imes  10236.023\,\, imes \,\,{10^{^{23}}}

    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, number of electrons per molecule

    4.

    The Largest number of molecules is in

    A

    36 g of water

    B

    28 g of carbon monoxide

    C

    46 g of ethyl alcohol

    D

    54 g of Nitrogen pentoxide

    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

    5.

    The number of moles in 11.2 L at STP of oxygen

    A

    1 mol

    B

    0.5 mol

    C

    2 mol

    D

    0.2 mol

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :STP, molar volume, moles

    6.

    Which of the following pair of gases contain the same number of molecules?

    A

    16gO2,14gN216{\rm{g}}{{\rm{O}}_2},14{\rm{g}}{{\rm{N}}_2}

    B

    8gO2,22gN28{\rm{g}}{{\rm{O}}_2},22{\rm{g}}{{\rm{N}}_2}

    C

    28gN2,22gCO228{\rm{g}}{{\rm{N}}_2},22{\rm{g C}}{{\rm{O}}_2}

    D

    32gO2,32gN232{\rm{g}}{{\rm{O}}_2},32{\rm{g}}{{\rm{N}}_2}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :moles, molar mass, Avogadro's number

    7.

    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

    8.

    Number of atoms in 3 mol of NH3N{H_3}

    A

    7.22imes10247.22 imes {10^{24}} atoms

    B

    7.22imes10237.22 imes {10^{23}} atoms

    C

    7.22imes10257.22 imes {10^{25}} atoms

    D

    All of these

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Avogadro's number, moles, chemical formula

    9.

    13.5 g aluminium changes to Al3+ion{\rm{A}}{{\rm{l}}^{3 + }}ion in solution by losing :

    A

    18imes102318 imes {10^{23}} electrons

    B

    6.023imes10236.023 imes {10^{23}} electrons

    C

    3.01imes10233.01 imes {10^{23}} electrons

    D

    9imes10239 imes {10^{23}} electrons

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :moles, atomic mass, Avogadro's number, ionization

    10.

    13.5 g aluminium changes to Al3+ion{\rm{A}}{{\rm{l}}^{3 + }}ion in solution by losing :

    A

    18imes102318 imes {10^{23}} electrons

    B

    6.023imes10236.023 imes {10^{23}} electrons

    C

    3.01imes10233.01 imes {10^{23}} electrons

    D

    9imes10239 imes {10^{23}} electrons

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :moles, atomic mass, ionization, electron count, avogadro's number

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