1.

    A compound contains 28% nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. If the atomic weight of nitrogen is 14, the atomic weight of the metal is:

    A

    12

    B

    24

    C

    36

    D

    48

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Mole Concept, Empirical Formula, Percentage Composition

    Related Questions

    1.

    Which of the following contains the largest number of atoms?

    A

    1 g of O2O_2

    B

    1 g of N2N_2

    C

    1 g of H2H_2

    D

    1 g of LiLi

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Mole Concept, Molar Mass, Number of Atoms

    2.

    If Avogadro's number were 6.022imes1015 mol−16.022 imes 10^{15} \, mol^{-1}, what would be the mass of one mole of water (H2_2O)? (Atomic masses: H = 1 u, O = 16 u)

    A

    18 g

    B

    1.8imes10−81.8 imes 10^{-8} g

    C

    18imes101518 imes 10^{15} g

    D

    Cannot be determined

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

    3.

    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

    10−3{10^{ - 3}} mol of water

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :moles, molar mass, density, ideal gas law, Avogadro's number

    4.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :moles, molar mass, Avogadro's number

    5.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Mole Concept, Molar Mass

    6.

    If you have 18g of water and 18g of oxygen, which contains a greater number of molecules?

    A

    18g of water

    B

    18g of oxygen

    C

    They contain the same number of molecules

    D

    Cannot be determined

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Mole Concept, Molar Mass

    7.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Mole Concept, Molar Mass

    8.

    7.5 gr of a gas occupy 5.8 L of volume at STP, the gas is

    A

    CO2

    B

    O2

    C

    Air (approximately)

    D

    H2

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Ideal Gas Law, Molar Mass, STP Conditions

    9.

    A gaseous mixture contains oxygen and nitrogen in the ratio of 1:41:4 by weight. Therefore, the ratio of their number of molecules is:

    A

    1:41:4

    B

    1:81:8

    C

    7:87:8

    D

    3:163:16

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :mole concept, molar mass, ratio

    10.

    In which case is the number of molecules of water maximum ?

    A

     10−3 mol  of water\,{\rm{1}}{{\rm{0}}^{{\rm{ - 3}}}}\,{\rm{mol}}\,\,{\rm{of}}\,{\rm{water}}

    B

    18 mL of water{\rm{18}}\,{\rm{mL}}\,{\rm{of}}\,{\rm{water}}

    C

     0.00224 L  of water vapours  at1atm and 273  K\,{\rm{0}}{\rm{.00224}}\,{\rm{L}}\,\,{\rm{of}}\,{\rm{water}}\,{\rm{vapours}}\,\,{\rm{at 1 atm }}\,{\rm{and }}\,{\rm{273}}\,\,{\rm{K}}

    D

    0.18  g  of  water{\rm{0}}{\rm{.18}}\,\,{\rm{g}}\,\,{\rm{of}}\,\,{\rm{water}}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :moles, density, molar mass, Avogadro's number, ideal gas law

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