1.

    The coagulation values (in millimoles per litre) of the electrolytes used for the coagulation of {As}2{S}3\{\rm As\}_2\{\rm S\}_3 are given below:

    I) {NaCl}=52\{\rm NaCl\} = 52

    II) {BaCl2}=0.69\{\rm BaCl_2\} = 0.69

    III) {MgSO4}=0.22\{\rm MgSO_4\} = 0.22

    What is the correct order of their coagulating power?

    A

    NaCl > BaCl2 > MgSO4

    B

    MgSO4 > BaCl2 > NaCl

    C

    BaCl2 > NaCl > MgSO4

    D

    MgSO4 > NaCl > BaCl2

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    PYQ YEAR: 2016
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Surface Chemistry, Coagulation, Coagulation Value, Coagulating Power

    Related Questions

    1.

    Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions, is

    A

    CH3(CH2)15N+(CH3)3Br−{\rm{C}}{{\rm{H}}_3}{\left( {{\rm{C}}{{\rm{H}}_2}} \right)_{15}}{{\rm{N}}^ + }{\left( {{\rm{C}}{{\rm{H}}_3}} \right)_3}{\rm{B}}{{\rm{r}}^ - }

    B

    CH3(CH2)11OSO3−Na+{\rm{C}}{{\rm{H}}_3}{\left( {{\rm{C}}{{\rm{H}}_2}} \right)_{11}}{\rm{OSO}}_3^ - {\rm{N}}{{\rm{a}}^ + }

    C

    CH3(CH2)6COO−Na+{\rm{C}}{{\rm{H}}_3}{\left( {{\rm{C}}{{\rm{H}}_2}} \right)_6}{\rm{CO}}{{\rm{O}}^ - }{\rm{N}}{{\rm{a}}^ + }

    D

    CH3(CH2)11N+(CH3)3Br−{\rm{C}}{{\rm{H}}_3}{\left( {{\rm{C}}{{\rm{H}}_2}} \right)_{11}}{{\rm{N}}^ + }{\left( {{\rm{C}}{{\rm{H}}_3}} \right)_3}{\rm{B}}{{\rm{r}}^ - }

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :surfactants, micelles, critical micelle concentration (CMC), hydrophobic effect

    2.

    Below critical micelle concentration (CMC)

    A

    Salt behaves as normal electrolyte

    B

    Substances like grease, fat dissolve by emulsification

    C

    The viscosity of solution is very high

    D

    Surfactant molecules undergo association to form cluster

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Critical Micelle Concentration (CMC), Electrolytes, Surfactants, Micelles

    3.

    An example of micelle is

    A

    AS2O3A{S_2}{O_3} sol

    B

    Ruby glass

    C

    Na2CO3N{a_2}C{O_3} solution

    D

    Sodium stearate concentrated solution

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Micelles, Colloids, Solutions

    4.

    Pick out the wrong statement.

    A

    Micelles are formed by surfactant molecules above the Critical Micelle Concentration (CMC)

    B

    The conductivity of a solution having surfactant molecules decreases sharply at the (CMC)

    C

    Lower is the CMC of detergent, more is its detergency

    D

    Cleansing action is not related to micelles

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :surfactants, micelles, critical micelle concentration (CMC), conductivity, detergency

    5.

    Which of the following forms cationic micelles above certain concentration?

    A

    Sodium dodecyl sulfate (SDS)

    B

    Dodecyl alcohol

    C

    Cetyltrimethylammonium bromide (CTAB)

    D

    Sugar

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :micelles, surfactants, critical micelle concentration, cationic surfactants

    6.

    Micelles have

    A

    Same colligative property as that of common colloidal solution

    B

    Lower colligative property as that of common colloidal solution

    C

    Higher colligative property as that of common colloidal solution

    D

    None of the above

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :colligative properties, micelles, colloidal solutions

    7.

    Potassium stearate is obtained by the saponification of an oil or fat. It has the formula

    CH3−(CH2)16−COO−K+{\rm{C}}{{\rm{H}}_3} - {\left( {{\rm{C}}{{\rm{H}}_2}} \right)_{16}} - {\rm{CO}}{{\rm{O}}^ - }{{\rm{K}}^ + }

    The molecular has a lyophobic end

    [CH3]{\rm{[C}}{{\rm{H}}_3}] and a lyophilic end COO−K+{\rm{CO}}{{\rm{O}}^ - }{{\rm{K}}^ + }.

    Potassium stearate is an example for

    A

    soap

    B

    detergent

    C

    both soap and detergent

    D

    none of these

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Colloids, Lyophobic, Lyophilic, Micelles, Saponification

    8.

    Associated colloid among the following is

    A

    Enzyme

    B

    Proteins

    C

    Cellulose

    D

    Sodium stearate

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Colloids, Associated colloids, Micelles

    9.

    An example of micelle is

    A

    AS2O3A{S_2}{O_3} sol

    B

    Ruby glass

    C

    Na2CO3N{a_2}C{O_3} solution

    D

    Sodium stearate concentrated solution

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :micelles, colloids, surfactants

    10.

    Which of the following is an example of associated colloid

    A

    Soap in water

    B

    Protein in water

    C

    Rubber in Benzene

    D

    AgNO3AgN{O_3} in water

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Surface Chemistry
    🎯Topic:Colloidal State
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :colloids, associated colloids, micelles

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