1.

    What is the mass of 0.2 moles of oxygen atoms?

    A

    1.6 g

    B

    3.2 g

    C

    6.4 g

    D

    16 g

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

    Related Questions

    1.

    The number of Na atoms in 46 g β€˜Na”

    A

    6.023{\mkern 1mu} {\mkern 1mu}  imes {\mkern 1mu} {\mkern 1mu} {10^{23}}

    B

    2

    C

    1

    D

    12.046{\mkern 1mu} {\mkern 1mu}  imes {\mkern 1mu} {\mkern 1mu} {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 :2 mins
    πŸ”„Ncert Concepts :Moles, Avogadro's Number, Atomic Mass

    2.

    Number of moles of Na2SO4N{a_2}S{O_4} produced from 1 mole of NaOH

    A

    12\frac{1}{2} mol

    B

    1 mol

    C

    2 mol

    D

    5 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 :Stoichiometry, Balancing Chemical Equations, Mole Ratios

    3.

    Upon heating, 15.0 g of impure zinc carbonate decomposes completely to produce zinc oxide and carbon dioxide. If 5.6 g of zinc oxide is formed, calculate the percentage purity of the zinc carbonate sample. (Atomic weight: Zn=65.4Zn = 65.4)

    A

    57.6

    B

    65.4

    C

    72.8

    D

    81.4

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Stoichiometry, Percentage Purity

    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
    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

    5.

    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

    6.

    The number of molecules present in 1 mL of gas or vapour at STP is:

    A

    Called Loschmidt’s number

    B

    Equal to 2.617imes1019permL2.617 imes {10^{19}}{\rm{per mL}}

    C

    Both (1) and (2)

    D

    None of the above

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Loschmidt's number, Standard Temperature and Pressure (STP), Number of molecules in a gas

    7.

    0.3 g of an oxalate salt was dissolved in 100 mL solution. The solution required 90 mL of N/20N/20 KMnO4{\rm{KMn}}{{\rm{O}}_4} for complete oxidation. The % of oxalate ion in salt is:

    A

    33%33\%

    B

    66%66\%

    C

    70%70\%

    D

    40%40\%

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

    8.

    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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2015
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Mole Concept, Avogadro's Number

    9.

    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

    10.

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

    A

    0.00224 L of water vapours at 1 atm and 273 K

    B

    0.18 g of water

    C

    18 ml of water

    D

    10⁻³ mol of water

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Mole Concept
    PYQ YEAR: 2018
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Mole Concept, Stoichiometry

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