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.

    What mass of AgCl is precipitated when 25 mL of a 8.45% \AgNO3\AgNO_3 solution is mixed with 50 mL of a 5.8% NaCl solution?

    A

    1.794 g

    B

    3.587 g

    C

    7.175 g

    D

    0.897 g

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Stoichiometry, Limiting Reagent, Precipitation Reactions

    2.

    Which of the following samples contain the least number of atoms

    A

    1g  of CO2(g)1g\,\,of\,C{O_2}\left( g \right)

    B

    1g of C8H18(l)1g\,of\,{C_8}{H_{18}}\left( l \right)

    C

    1g of C2H6(g)1g\,of\,{C_2}{H_6}\left( g \right)

    D

    1g of LiF(s)1g\,of\,LiF\left( s \right)

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

    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.

    1 mol of CH4C{H_4} contains

    A

    6.02imes10236.02 imes {10^{23}} atoms of H

    B

    4 g.atom of Hydrogen

    C

    1.81imes10231.81 imes {10^{23}} molecules of CH4C{H_4}

    D

    3.0 g of carbon

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

    5.

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

    A

    12g

    B

    22g

    C

    44g

    D

    66g

    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 1 mole of a substance contains 6.022imes10236.022 imes 10^{23} particles, how many particles are present in 0.5 moles?

    A

    1.505 x 10^23

    B

    3.011 x 10^23

    C

    6.022 x 10^23

    D

    12.044 x 10^23

    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, Avogadro's Number

    7.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :moles, molar mass, Avogadro's number, number of electrons per molecule

    8.

    What is the mass of the precipitate formed when 50 mL of 16.9% solution of \AgNO3\AgNO_3 is mixed with 50 mL of 5.8% NaCl solution?

    A

    7.175 g

    B

    14.35 g

    C

    3.587 g

    D

    10.76 g

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Stoichiometry, Limiting Reagent, Precipitation Reactions

    9.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :molar mass, moles, Avogadro's number, number of atoms in a molecule

    10.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Molecular weight, Vapour density

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