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Chemistry M.C.Q [1M]

Surface Chemistry · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 30 questions.

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M.C.Q [1M]

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30 questions · timed · auto-graded

MCQ 11 Mark
Hardening of leather in tanning industry is based on :
  • A
    Electrophoresis
  • B
    Electro-osmosis
  • ✓
    Mutual coagulation
  • D
    Tyndall effect
Answer
Correct option: C.
Mutual coagulation
C
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MCQ 31 Mark
According to Freundlich adsorption isotherm :
  • ✓
    $\frac{x}{m}=kp^{1/n}$
  • B
    $\frac{m}{x}=k.p^{1/n}$
  • C
    $xm=kp^{1/n}$
  • D
    $\frac{x}{m}=\frac{k}{p^{1/n}}$
Answer
Correct option: A.
$\frac{x}{m}=kp^{1/n}$
A
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MCQ 41 Mark
Milk is :
  • ✓
    fat dispersed in water
  • B
    water dispersed in fat
  • C
    water dispersed in oil
  • D
    fat dispersed in fat
Answer
Correct option: A.
fat dispersed in water
A
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MCQ 51 Mark
In physical adsorption the approximate heat energy evolved in kJ/mol is :
  • ✓
    20-40
  • B
    40-60
  • C
    60-80
  • D
    40-400
Answer
Correct option: A.
20-40
A
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MCQ 81 Mark
Chemical adsorption reaction is :
  • A
    Reversible
  • ✓
    Irreversible
  • C
    Polymerisation
  • D
    None of these
Answer
Correct option: B.
Irreversible
B
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MCQ 91 Mark
Which of the following in not shows Tyndall effect?
  • A
    Suspension
  • B
    Emulsion
  • ✓
    Sugar solution
  • D
    Gold solution
Answer
Correct option: C.
Sugar solution
C
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MCQ 101 Mark
When NaCl solution is added to $Fe(OH)_{3}$ colloidal solution then :
  • A
    $[Fe(OH)_{3}]Fe^{3+}$ is formed
  • B
    $[Fe(OH)_{3}]Cl^{-}$ is formed
  • C
    $[Fe(OH)_{3}]Na^{+}$ is formed
  • ✓
    $Fe(OH)_{3}$ is coagulated
Answer
Correct option: D.
$Fe(OH)_{3}$ is coagulated
D
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MCQ 111 Mark
According to adsorption theory of catalysis, the speed of the reaction increases because :
  • A
    The conc. of the reactant molecules at the active centres of the catalyst increases due to adsorption
  • B
    The activation energy of molecules increase in the adsorption process
  • C
    Adsorption produces heat which increases the rate of reaction
  • ✓
    Adsorption decreases the activation energy of reaction
Answer
Correct option: D.
Adsorption decreases the activation energy of reaction
D
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MCQ 121 Mark
The movement of colloidal particles in electric field is called :
  • A
    Dialysis
  • ✓
    Electrophoresis
  • C
    Peptization
  • D
    None of these
Answer
Correct option: B.
Electrophoresis
B
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MCQ 131 Mark
The fresh precipitate can be transformed in colloidal solution by :
  • A
    Coagulation
  • ✓
    Peptization
  • C
    Diffusion
  • D
    None of these
Answer
Correct option: B.
Peptization
B
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MCQ 141 Mark
Peptisation process is :
  • A
    Precipitation of colloidal particle
  • ✓
    Purification of colloid
  • C
    Dispersion of ppt in colloidal state
  • D
    None of these
Answer
Correct option: B.
Purification of colloid
B
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MCQ 151 Mark
Lyophilic colloids are stable due to :
  • A
    charge of the particles
  • B
    large size of the particles
  • C
    small size of the particles
  • ✓
    layer of dispersion medium on the particles
Answer
Correct option: D.
layer of dispersion medium on the particles
D
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MCQ 161 Mark
Which of the following colloidal system is example of Fog?
  • A
    Gas in liquid
  • ✓
    Liquid in gas
  • C
    Solid in liquid
  • D
    Liquid in liquid
Answer
Correct option: B.
Liquid in gas
B
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MCQ 181 Mark
Cod liver oil is :
  • A
    Water in fat
  • B
    Fat in water
  • ✓
    Oil in water
  • D
    Fat in fat
Answer
Correct option: C.
Oil in water
C
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MCQ 191 Mark
Which of the following is a lyophobic colloid?
  • A
    Gelatin
  • ✓
    Sulphur
  • C
    Starch
  • D
    Arabic Gum
Answer
Correct option: B.
Sulphur
B
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MCQ 201 Mark
Chromotography technique is based on :
  • ✓
    Solubility of solute
  • B
    Adsorption of solute
  • C
    Chemical adsorption followed by dispersion
  • D
    Adsorption efficiency of different constituents of mixture
Answer
Correct option: A.
Solubility of solute
A
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MCQ 211 Mark
Which of the following is false for physical adsorption?
  • A
    Adsorption on solids is reversible
  • ✓
    Adsorption increases with increases in temperature
  • C
    Adsorption is spontaneous
  • D
    Both enthalpy and entropy of adosorption are negative
Answer
Correct option: B.
Adsorption increases with increases in temperature
B
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MCQ 221 Mark
Adsorption is used in all cases except :
  • A
    for decolourising
  • ✓
    In homogeneous catalysis
  • C
    In separation of inert gases
  • D
    In dehumidisers
Answer
Correct option: B.
In homogeneous catalysis
B
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MCQ 231 Mark
The physical adsorption of gases on the solid surface is due to :
  • A
    Hydrogen bonding
  • B
    Covalent bonding
  • ✓
    Van der Waal's force
  • D
    Ionic bonding
Answer
Correct option: C.
Van der Waal's force
C
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MCQ 241 Mark
Which one of the following forms micelles in aqueous solution above certain concentration?
  • A
    Urea
  • ✓
    Dodecyl trimethyl ammonium chloride
  • C
    Pyridinium Chloride
  • D
    Glucose
Answer
Correct option: B.
Dodecyl trimethyl ammonium chloride
B
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MCQ 251 Mark
Lyophilic sols are :
  • A
    Irreversible sols
  • B
    Prepared by inorganic compounds
  • C
    Coagulated by adding electrolyte
  • ✓
    Self stabilizer
Answer
Correct option: D.
Self stabilizer
D
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MCQ 271 Mark
The method usually employed for the destruction of colloidal solution is :
  • ✓
    addition of electrolyte
  • B
    diffusion through animal membrane
  • C
    condensation
  • D
    dialysis
Answer
Correct option: A.
addition of electrolyte
A
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MCQ 281 Mark
Rate of physisorption increases with :
  • ✓
    Decrease in temperature
  • B
    Increase in temperature
  • C
    Decrease in pressure
  • D
    Decrease in the surface area
Answer
Correct option: A.
Decrease in temperature
A
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MCQ 291 Mark
Emulsion is a colloidal solution :
  • A
    Two solids
  • ✓
    Two liquids
  • C
    Two gases
  • D
    One solid and one liquid
Answer
Correct option: B.
Two liquids
B
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MCQ 301 Mark
Which one of the following statements is false in the reference of Zeolites?
  • A
    They are used as cation exchanger
  • ✓
    They have open structure which enables them to take small molecules
  • C
    They are alumino silicates having three dimensional network
  • D
    Some of the $SiO _4^{-4}$ units are replaced by $AlO _4^{5-}$ and $AlO _6^{9-}$ ions in zeolites
Answer
Correct option: B.
They have open structure which enables them to take small molecules
B
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M.C.Q [1M] - Chemistry STD 12 Science Questions - Vidyadip