1.

    Which of the following is used as a depressant in the froth flotation process for separating ZnS and PbS?

    A

    NaCN

    B

    Pine oil

    C

    Water

    D

    Xanthates

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

    Related Questions

    1.

    2 grams of sodium hydroxide was treated with 50mL50 \mathrm{mL} of 0.75M0.75 \mathrm{M} HCl solution. The mass of sodium hydroxide left unreacted is equal to

    A

    0.5 g

    B

    0.25 g

    C

    1 g

    D

    0.75 g

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2024
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Stoichiometry, Neutralization Reaction

    2.

    0.5 grams of sodium hydroxide was treated with 12.5mL12.5 \mathrm{mL} of 0.75M0.75 \mathrm{M} HCl solution. The mass of sodium hydroxide left unreacted is equal to

    A

    0.125 g

    B

    0.25 g

    C

    0.5 g

    D

    0 g

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    PYQ YEAR: 2024
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Stoichiometry, Neutralization Reaction

    3.

    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

    4.

    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

    5.

    The number of moles of KMnO4KMn{O_4} that will be needed to react completely with one mole of oxalate ion in acidic solution is

    A

    52\frac{5}{2}

    B

    32\frac{3}{2}

    C

    25\frac{2}{5}

    D

    12\frac{1}{2}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Redox reactions, Balancing chemical equations, Stoichiometry

    6.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Equivalent weight, Oxidation state, Redox reaction

    7.

    A binary solution of liquids A and B shows positive deviation from Raoult's law. Which of the following statements is TRUE?

    A

    The intermolecular forces between A and B are weaker than those between A-A and B-B.

    B

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

    C

    The solution exhibits a negative deviation from Raoult's law.

    D

    The total vapor pressure of the solution is less than the sum of the vapor pressures of the pure components.

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Raoult's Law, Intermolecular Forces, Deviations from Raoult's Law

    8.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Solutions, Concentration, Mass Percentage

    9.

    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
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Molarity, Dilution, Moles, Equivalents

    10.

    The least count of burette used normally in laboratory is :

    A

    0.1 mL

    B

    0.01 mL

    C

    0.2 mL

    D

    0.02 mL

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Concentration Methods
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Least count, Laboratory apparatus

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