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Chemistry MCQ

Adsorption and Colloids · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 57 questions.

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MCQ 11 Mark
Identify the colloidal molecule containing hydrophilic head and hydrophobic tail within it.
  • A
    Starch
  • ✓
    Detergent
  • C
    Gold sol
  • D
    Cellulose
Answer
Correct option: B.
Detergent
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MCQ 21 Mark
Which among the following is a negatively charged sol?
  • A
    $\mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O}$
  • B
    $\mathrm{TiO}_2$
  • ✓
    CdS
  • D
    $\mathrm{CrO}_3 \cdot \mathrm{xH}_2 \mathrm{O}$
Answer
Correct option: C.
CdS
C
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MCQ 31 Mark
Which of the following is NOT a characteristic of chemisorption?
  • A
    It is specific.
  • B
    It is irreversible.
  • ✓
    Formation of multimolecular layer of adsorbate.
  • D
    Heat of adsorption is in the range of $40-200 kJ mol ^{-1}$.
Answer
Correct option: C.
Formation of multimolecular layer of adsorbate.
C
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MCQ 41 Mark
What type of following phenomena is NOT exhibited by adsorption?
  • A
    Exothermic
  • ✓
    Bulk
  • C
    Irreversible
  • D
    Endothermic
Answer
Correct option: B.
Bulk
B
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MCQ 51 Mark
Which among the following compounds represents a soap molecule ?
  • ✓
    Potassium salt of higher fatty acids.
  • B
    Ammonium salt of formic acid.
  • C
    Ammonium salt of higher fatty acids.
  • D
    Sodium salt of formic acid.
Answer
Correct option: A.
Potassium salt of higher fatty acids.
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MCQ 61 Mark
Identity correct statement for "oil in water" type of emulsion.
  • A
    Water is dispersed phase.
  • B
    No effect on conducting power when small amount of an electrolyte is added.
  • C
    Oil is dispersion medium.
  • ✓
    Basic metal sulfates are used as emulsifiers.
Answer
Correct option: D.
Basic metal sulfates are used as emulsifiers.
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MCQ 71 Mark
What is effect of pressure on extent of adsorption?
  • A
    AL Increases as pressure increases continuously
  • B
    Decrease as pressure increases
  • C
    No change in extent of adsorption if pressure increases or decreases
  • ✓
    Increases at start as pressure increases and then remains constant
Answer
Correct option: D.
Increases at start as pressure increases and then remains constant
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MCQ 81 Mark
Which among the following is an example of sorption?
  • A
    Hydrogen gas is passed over platinum
  • B
    Oxygen gas is passed over finely divided nickel
  • C
    Charcol is added to methylene blue solution
  • ✓
    Chalk is dipped in ink
Answer
Correct option: D.
Chalk is dipped in ink
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MCQ 91 Mark
Identify the colloidal molecule containing hydrophilic head and hydrophobic tail within it.
  • A
    Starch
  • ✓
    Detergent
  • C
    Gold sol
  • D
    Cellulose
Answer
Correct option: B.
Detergent
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MCQ 101 Mark
Which among the following is a negatively charged sol?
  • A
    $\mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O}$
  • B
    $\mathrm{TiO}_2$
  • ✓
    CdS
  • D
    $\mathrm{CrO}_3 \cdot \mathrm{xH}_2 \mathrm{O}$
Answer
Correct option: C.
CdS
C
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MCQ 111 Mark
Which of the following is NOT a characteristic of chemisorption?
  • A
    It is specific.
  • B
    It is irreversible.
  • ✓
    Formation of multimolecular layer of adsorbate.
  • D
    Heat of adsorption is in the range of $40-200\ kJ\ mol ^{-1}$.
Answer
Correct option: C.
Formation of multimolecular layer of adsorbate.
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MCQ 121 Mark
What type of following phenomena is NOT exhibited by adsorption?
  • A
    Exothermic
  • ✓
    Bulk
  • C
    Irreversible
  • D
    Endothermic
Answer
Correct option: B.
Bulk
B
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MCQ 131 Mark
Which among the following compounds represents a soap molecule ?
  • ✓
    Potassium salt of higher fatty acids.
  • B
    Ammonium salt of formic acid.
  • C
    Ammonium salt of higher fatty acids.
  • D
    Sodium salt of formic acid.
Answer
Correct option: A.
Potassium salt of higher fatty acids.
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MCQ 141 Mark
Identity correct statement for "oil in water" type of emulsion.
  • A
    Water is dispersed phase.
  • B
    No effect on conducting power when small amount of an electrolyte is added.
  • C
    Oil is dispersion medium.
  • ✓
    Basic metal sulfates are used as emulsifiers.
Answer
Correct option: D.
Basic metal sulfates are used as emulsifiers.
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MCQ 151 Mark
What is effect of pressure on extent of adsorption?
  • A
    AL Increases as pressure increases continuously
  • B
    Decrease as pressure increases
  • C
    No change in extent of adsorption if pressure increases or decreases
  • ✓
    Increases at start as pressure increases and then remains constant
Answer
Correct option: D.
Increases at start as pressure increases and then remains constant
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MCQ 161 Mark
Which among the following is an example of sorption?
  • A
    Hydrogen gas is passed over platinum
  • B
    Oxygen gas is passed over finely divided nickel
  • C
    Charcol is added to methylene blue solution
  • ✓
    Chalk is dipped in ink
Answer
Correct option: D.
Chalk is dipped in ink
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MCQ 181 Mark
In Haber process of production of ammonia K2O is used as
  • A
    catalyst
  • B
    inhibitor
  • ✓
    promotor
  • D
    adsorbate
Answer
Correct option: C.
promotor
promotor
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MCQ 191 Mark
Gum in water is an example of
  • A
    true solution
  • B
    suspension
  • ✓
    lyophilic sol
  • D
    lyophobic sol
Answer
Correct option: C.
lyophilic sol
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MCQ 201 Mark
The size of colloidal particles lies between
  • A
    $10^{-10} m$ and $10^{-9} m$
  • ✓
    $10^{-9} m$ and $10^{-6} m$
  • C
    $10^{-6} m$ and $10^{-4} m$
  • D
    $10^{-5} m$ and $10^{-2} m$
Answer
Correct option: B.
$10^{-9} m$ and $10^{-6} m$
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MCQ 211 Mark
Which of the following colloids is not a gel?
  • A
    Cheese
  • B
    Butter
  • ✓
    Milk
  • D
    Jellies
Answer
Correct option: C.
Milk
(c) : Milk is not a gel.
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MCQ 221 Mark
Which of the following gases is readily adsorbed by solid adsorbent?
  • ✓
    $Cl _2$
  • B
    $N _2$
  • C
    $O _2$
  • D
    $H _2$
Answer
Correct option: A.
$Cl _2$
(a) : Greater is the size of molecule, greater will be the van der Waals attraction, higher will be the critical temperature and more easily the gas can be liquefied and adsorbed.
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MCQ 231 Mark
Which from following catalyst is used in decomposition of $KClO _3$ ?
Answer
Correct option: D.
$MnO _2$
(d): $2 KClO _{3(a)} \xrightarrow[ MnO , 2]{\Delta} 2 KCl _{(a)}+3 O _{2(s)}$
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MCQ 241 Mark
Which of the following ion has greater coagulating power  for negatively charged sol?
Answer
Correct option: D.
$Al ^{3+}$
(d): According to Hardy-Schulze rule, the greater the valence of the flocculating ion added, the greater is its power to cause precipitation. In the coagulation
of a negative sol, the flocculating power is in the order $Al ^{3+}> Ba ^{2+}> Na ^{+}$.
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MCQ 251 Mark
Which property of colloids is not dependent on the charge on colloidal particles?
  • A
  • B
    Electrophoresis
  • C
    Both (a) and (b)
  • ✓
    Tyndall effect
Answer
Correct option: D.
Tyndall effect
(d) : Tyndall effect is due to the scattering of light by colloidal particles and it is an optical property.
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MCQ 271 Mark
The enzyme which converts maltose to glucose is
  • ✓
    maltase
  • B
    insulin
  • C
    Iysine
  • D
    zymase.
Answer
Correct option: A.
maltase
(a) maltase
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MCQ 291 Mark
In preparation of sulphuric acid from sulphur dioxide in lead chamber process, what substance is used as a catalyst?
  • A
    Manganese dioxide
  • B
    Vanadium pentoxide
  • ✓
    Nitric oxide
  • D
    Raney Nickel
Answer
Correct option: C.
Nitric oxide
(c) Nitric oxide
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MCQ 301 Mark
Which of the following has highest precipitation power to precipitate negative sol?
  • ✓
    $Al ^{3+}$
  • B
    $Mg ^{2+}$
  • C
    $Na ^{+}$
  • D
    $K ^{+}$
Answer
Correct option: A.
$Al ^{3+}$
(A) $Al ^{3+}$
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MCQ 311 Mark
……………… is an example of water in oil type of emulsion.
  • A
    Milk
  • ✓
    Cod liver oil
  • C
    Vanishing cream
  • D
    Paint
Answer
Correct option: B.
Cod liver oil
(B) Cod liver oil
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MCQ 321 Mark
The capacity of an ion to coagulate a colloidal solution depends on ……………….
  • A
    its shape
  • B
    its valency
  • C
    the sign of charge
  • ✓
    both (B) and (C)
Answer
Correct option: D.
both (B) and (C)
(D) both (B) and (C)
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MCQ 331 Mark
The migration of colloidal particles under the influence of an electric field is called …………….
  • A
    catalysis
  • B
    Brownian movement
  • ✓
    electrophoresis
  • D
    Tyndall effect
Answer
Correct option: C.
electrophoresis
(C) electrophoresis
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MCQ 341 Mark
Brownian movement is a ……………… type of property of the colloidal sol.
  • A
    electrical
  • B
    optical
  • ✓
    kinetic
  • D
    colligative
Answer
Correct option: C.
kinetic
(C) kinetic
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MCQ 351 Mark
Tyndall effect is useful ……………….
  • A
    to identify colloidal dispersions
  • B
    to count number of particles in colloidal dispersion.
  • C
    to determine the size of the colloidal particles
  • ✓
    all of these
Answer
Correct option: D.
all of these
(D) all of these
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MCQ 361 Mark
Which of the following is NOT an example of macromolecular colloid?
  • A
    Starch
  • B
    Proteins
  • ✓
    $S _8$ molecules
  • D
    Nylon
Answer
Correct option: C.
$S _8$ molecules
(C) $S _8$ molecules
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MCQ 371 Mark
Colloidal solution in which the dispersed phase has little affinity for the dispersion medium is called ………………
  • ✓
    lyophobic colloids
  • B
    lyophilic colloids
  • C
    hydrophilic colloids
  • D
    emulsions
Answer
Correct option: A.
lyophobic colloids
(A) lyophobic colloids
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MCQ 381 Mark
The dispersed phase in Pumice stone is ……………
  • A
    solid
  • B
    liquid
  • ✓
    gas
  • D
    none of these
Answer
Correct option: C.
gas
(C) gas
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MCQ 391 Mark
An aerosol is a dispersion of a ……………
  • A
    gas in a solid
  • B
    liquid in a gas
  • C
    solid in a gas
  • ✓
    both (B) and (c)
Answer
Correct option: D.
both (B) and (c)
(D) both (B) and(c)
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MCQ 401 Mark
Whether a given mixture forms a true solution or a colloidal dispersion depends on the …………….
  • A
    charge of solute particles
  • B
    size of solvent particles
  • ✓
    size of solute particles
  • D
    charge of solvent particles
Answer
Correct option: C.
size of solute particles
(C) size of solute particles
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MCQ 411 Mark
A substance that decreases the rate of a chemical reaction is called ……………
  • ✓
    inhibitor
  • B
    prohibitor
  • C
    promoter
  • D
    reactor
Answer
Correct option: A.
inhibitor
(A) inhibitor
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MCQ 421 Mark
In Haber process for manufacture of NH3, the catalyst used is ……………
  • ✓
    iron
  • B
    copper
  • C
    vanadium pentoxide
  • D
    nickel
Answer
Correct option: A.
iron
(A) iron
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MCQ 431 Mark
The adsorption isotherm tends to saturate at ………….. pressure.
  • A
    low
  • B
    moderate
  • C
    all of these
  • ✓
    high
Answer
Correct option: D.
high
(D) high
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MCQ 441 Mark
When log x/m is plotted against log P, the intercept obtained …………..
  • ✓
    on Y axis is equal to log K
  • B
    on Y axis is equal to K
  • C
    on X axis is equal to log K
  • D
    on X axis is equal to K
Answer
Correct option: A.
on Y axis is equal to log K
(A) on Y axis is equal to log K
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MCQ 451 Mark
For equilibrium pressure (P), the mass of gas adsorbed (x) and mass of adsorbent (m) may be expressed as Freundlich adsorption isotherm as ……………
  • A
    $\frac{m}{x}=k P^{\frac{1}{n}}$
  • ✓
    $\frac{x}{m}=k P^{\frac{1}{n}}$
  • C
    $x m=k P^{\frac{1}{n}}$
  • D
    $\frac{x}{m}=k\left(\frac{1}{p}\right)^n$
Answer
Correct option: B.
$\frac{x}{m}=k P^{\frac{1}{n}}$
(B) $\frac{x}{m}=k P^{\frac{1}{n}}$
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MCQ 461 Mark
The relation between the amount of substance adsorbed by an adsorbent and the equilibrium pressure or …………. at any constant temperature is called adsorption isotherm.
  • A
    surface area
  • B
    volume
  • C
    circumference
  • ✓
    concentration
Answer
Correct option: D.
concentration
(D) concentration
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MCQ 471 Mark
Which of the following is adsorbed to maximum extent on charcoal?
  • A
    $H _2$
  • B
    $N _2$
  • ✓
    $Cl _2$
  • D
    $O _2$
Answer
Correct option: C.
$Cl _2$
(C) $Cl _2$
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MCQ 481 Mark
Which of the following statements is CORRECT regarding chemical adsorption?
  • A
    It is highly specific in nature.
  • B
    It is relatively strong.
  • C
    It involves the formation of monolayer of adsorbed particles.
  • ✓
    All of these.
Answer
Correct option: D.
All of these.
(D) All of these.
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MCQ 491 Mark
The number of layer(s) formed on adsorbent in chemical adsorption is …………….
  • ✓
    one
  • B
    two
  • C
    three
  • D
    many
Answer
Correct option: A.
one
(A) one
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MCQ 501 Mark
Chemisorption is a slow process because …………….
  • A
    it forms multimolecular layer
  • B
    it is reversible
  • C
    it takes place at normal temperature
  • ✓
    it requires high activation energy
Answer
Correct option: D.
it requires high activation energy
(D) it requires high activation energy
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