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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Surface Chemistry, Colloids, Purification Techniques

    Related Questions

    1.

    In the reaction, VO+Fe2O3oFeO+V2O5.{\rm{VO}} + {\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3} o {\rm{FeO}} + {{\rm{V}}_2}{{\rm{O}}_5}{\rm{.}}. The eq.wt. of V2O5{{\rm{V}}_2}{{\rm{O}}_5} is equal to its :

    A

    mol. wt.

    B

    mol.wt./8mol.{\rm{ }}wt./8

    C

    mol.wt./6mol.{\rm{ }}wt./6

    D

    None of these

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Equivalent weight, Oxidation state, Redox reaction

    2.

    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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2015
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Mole Fraction, Molality, Solutions

    3.

    The speed of sound in air is dependent on temperature. Which of the following correctly describes this relationship?

    A

    Speed of sound decreases with increasing temperature

    B

    Speed of sound increases with increasing temperature

    C

    Speed of sound is independent of temperature

    D

    Speed of sound initially increases then decreases with increasing temperature

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2017
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Speed of Sound, Temperature, Waves

    4.

    A standard solution is one whose :

    A

    Concentration is 1 MM

    B

    Concentration is unknown

    C

    Concentration is known

    D

    None of the above

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Standard solution, concentration

    5.

    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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2015
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Mole Fraction, Molality, Solutions

    6.

    100 mL of 0.1 M solution of a reductant is diluted to 1 litre, which of the following changes?

    A

    Molarity

    B

    Millimole

    C

    Milliequivalent

    D

    None of these

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Molarity, Dilution, Moles, Equivalents

    7.

    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
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :0.5 mins
    πŸ”„Ncert Concepts :Solutions, Concentration, Molality

    8.

    Which of the following is NOT a method for expressing the concentration of a solution?

    A

    Molarity

    B

    Molality

    C

    Mass percentage

    D

    Density

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :0.5 mins
    πŸ”„Ncert Concepts :Solutions, Concentration Methods

    9.

    A 0.5 molal aqueous solution of urea (CON2H4CON_2H_4) is prepared. What is the mole fraction of urea?

    A

    0.0089

    B

    0.0090

    C

    0.50

    D

    0.99

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2015
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Mole Fraction, Molality, Solutions

    10.

    A solution is prepared by dissolving 10 g of glucose in 190 g of water. What is the mass percentage of glucose in the solution?

    A

    5%

    B

    10%

    C

    2%

    D

    95%

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Solutions, Concentration, Mass Percentage

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