1.

    A colloidal solution of gold nanoparticles is prepared by reduction of HAuCl4HAuCl_4. Which of the following methods is MOST EFFECTIVE for purifying this solution from excess reactants and small ionic byproducts?

    A

    Filtration

    B

    Centrifugation

    C

    Dialysis

    D

    Evaporation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Surface Chemistry, Colloids, Purification Techniques

    Related Questions

    1.

    A solution is prepared by dissolving 0.5 moles of solute in 250 g of solvent. What is the molality of the solution?

    A

    2 m

    B

    0.5 m

    C

    1 m

    D

    4 m

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Solutions, Molality

    2.

    In the leaching of alumina from bauxite, the concentration of the ore is achieved by:

    A

    Selective dissolution of alumina

    B

    Froth flotation

    C

    Magnetic separation

    D

    Electrolysis

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Leaching, Bauxite, Alumina

    3.

    Which method is employed for concentrating sulfide ores?

    A

    Froth flotation

    B

    Magnetic separation

    C

    Leaching

    D

    Gravity separation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Froth flotation, Sulfide ores

    4.

    Which of these is the correct formula for calculating molality?

    A

    Moles of solute / Liters of solution

    B

    Moles of solute / Kilograms of solvent

    C

    Grams of solute / Liters of solution

    D

    Grams of solute / Kilograms of solvent

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Solutions, Concentration, Molality

    5.

    What is the molarity of a solution containing 1 mole of solute in 500 mL of solution?

    A

    0.5 M

    B

    1 M

    C

    2 M

    D

    4 M

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Solutions, Molarity

    6.

    Which concentration term is independent of temperature?

    A

    Molarity

    B

    Molality

    C

    Normality

    D

    Formality

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Solutions, Molality, Temperature Dependence

    7.

    What is the unit of molarity?

    A

    mol/kg

    B

    mol/L

    C

    g/L

    D

    g/mol

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Solutions, Concentration, Molarity

    8.

    The process of removing gangue from ore is known as:

    A

    Concentration

    B

    Refining

    C

    Smelting

    D

    Roasting

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Concentration of ores, Gangue

    9.

    Chromite ore is concentrated by:

    A

    Magnetic separation

    B

    Froth flotation

    C

    Leaching

    D

    Gravity separation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Magnetic separation, Chromite

    10.

    Which of the following methods is NOT typically used for concentrating a dilute ore?

    A

    Froth flotation

    B

    Magnetic separation

    C

    Gravity separation

    D

    Distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :0.5 mins
    🔄Ncert Concepts :Concentration of ores, Froth flotation, Magnetic separation, Gravity separation, Distillation

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