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 mixture of two volatile liquids A and B shows a negative deviation from Raoult's law. Which of the following statements is INCORRECT regarding this mixture?

    A

    The enthalpy of mixing is negative.

    B

    The volume of mixing is negative.

    C

    The boiling point of the mixture is lower than that predicted by Raoult's law.

    D

    The intermolecular forces between A and B are stronger than the A-A and B-B interactions.

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :1.5 mins
    🔄Ncert Concepts :Solutions, Raoult's Law, Intermolecular Forces

    2.

    A solution is prepared by dissolving 2.5g of a non-volatile solute in 100g of water. The vapor pressure of the solution is found to be 22.87 Torr at 25∘C25^\circ C. If the vapor pressure of pure water is 23.76 Torr at the same temperature, what is the molar mass of the solute (in g/mol)?

    A

    60

    B

    120

    C

    30

    D

    90

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Solutions, Raoult's Law, Colligative Properties, Molar Mass

    3.

    What is the molality of a solution where the mole fraction of the solute is 0.02 and the solvent is water?

    A

    1.13 m

    B

    0.02 m

    C

    0.98 m

    D

    55.51 m

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2015
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Mole Fraction, Molality, Solutions

    4.

    A solution is prepared by dissolving 10 g of sucrose (C12H22O11C_{12}H_{22}O_{11}) in 200 g of water. What is the mole fraction of sucrose?

    A

    0.0026

    B

    0.0292

    C

    0.0500

    D

    0.997

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

    5.

    If 20 g of solute is dissolved in 80 g of solvent, what is the mass percentage of the solute?

    A

    20%

    B

    80%

    C

    25%

    D

    40%

    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, Mass Percentage

    6.

    A binary liquid mixture of components A and B exhibits an azeotrope at a specific composition. Which of the following statements is ALWAYS true about this azeotropic mixture?

    A

    The composition of the vapor phase is identical to the composition of the liquid phase.

    B

    The boiling point of the azeotrope is the average of the boiling points of pure A and B.

    C

    The azeotrope can be separated into pure A and B by fractional distillation.

    D

    The azeotrope always shows a positive deviation from Raoult's Law.

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Solutions, Azeotropes, Distillation

    7.

    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

    8.

    What is the mole fraction of the solute in a 1.00 m aqueous solution of glucose?

    A

    0.0177

    B

    0.0180

    C

    0.982

    D

    1.00

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2015
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Mole Fraction, Molality, Solutions

    9.

    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

    10.

    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

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