Class 12 Chemistry Ch-5 Surface Chemistry MCQs Exam 2027 
Class 12 Chemistry Ch-5 Surface Chemistry MCQs Exam 2027 Details: नीचे दिए गए सभी Questions Bihar Board परीक्षा 2027 के लिए “Very Very Important Multiple Choice Questions (MCQs) Objective” (अत्यंत महत्वपूर्ण प्रश्न) हैं। इन सभी Class 12th Chemistry /रसायन विज्ञानं ) = रसायन विज्ञानं भाग-1 (English Medium) Book Chapter-5 Surface Chemistry का Questions का Solve का वीडियो Youtube और Website पर Upload किया है।
Chemistry – Chapter: Surface Chemistry
TOPIC 1: Adsorption (Physical & Chemical)
In a reaction, a Catalyst: [BSEB, 2020 A] [Exam Year 2026]
(A) Increases activation energy
(B) Decreases activation energy
(C) Increases enthalpy
(D) None of these
The heat evolved in physical adsorption is approximately (in kJ/mol): [BSEB, 2021 A] [Exam Year 2026]
(A) 20-40
(B) 40-60
(C) 60-80
(D) 40-100
$P_2O_5$ is a good: [BSEB, 2017 C] [Exam Year 2026]
(A) Adsorbent
(B) Absorbent
(C) Reducing agent
(D) Color destroyer
The rate of chemical adsorption: [BSEB, 2022 A] [Exam Year 2026]
(A) Decreases with increase in pressure
(B) Does not depend on pressure
(C) Is maximum at one atmospheric pressure
(D) Increases with increase in pressure
The process of physical adsorption occurs at: [Exam Year 2026]
(A) Room temperature
(B) High temperature
(C) Any temperature
(D) Very low temperature
At 298 K, which gas will be adsorbed in maximum volume by 1g of charcoal? [BSEB, 2023 A] [Exam Year 2026]
(A) $H_2$
(B) $CH_4$
(C) $CO_2$
(D) $NH_3$
The process of adsorption is: [Exam Year 2026]
(A) Endothermic
(B) Surface phenomenon
(C) Oxidation
(D) Reduction
How many layers are formed in chemical adsorption? [BSEB, 2021 A] [Exam Year 2026]
(A) One
(B) Two
(C) Many
(D) Zero
For adsorption of a gas on a solid surface, the slope of the graph between $\log x/m$ and $\log P$ is equal to: [BSEB, 2018 C] [Exam Year 2026]
(A) $K$
(B) $\log K$
(C) $\ln K$
(D) $1/n$
Chemical adsorption reaction is: [BSEB, 2020 A] [Exam Year 2026]
(A) Reversible
(B) Irreversible
(C) Polymerization
(D) None of these
The nature of physical adsorption is: [Exam Year 2026]
(A) Specific
(B) Non-specific (Universal)
(C) Irreversible
(D) None of these
Langmuir adsorption isotherm is based on: [Exam Year 2026]
(A) Multi-layer adsorption
(B) Unilayer (Monolayer) adsorption
(C) Absorption
(D) None of these
The process of adsorption of gas on solid surface is: [Exam Year 2026]
(A) Endothermic
(B) Exothermic
(C) Both (A) and (B)
(D) None of these
The extent of adsorption ($x/m$) depends on: [Exam Year 2026]
(A) Nature of gas
(B) Pressure
(C) Temperature
(D) All of the above
What is the change in entropy ($\Delta S$) during adsorption? [Exam Year 2026]
(A) Entropy increases
(B) Entropy decreases
(C) Remains zero
(D) Uncertain
Free energy in adsorption is called: [Exam Year 2026]
(A) Gibbs free energy
(B) Internal energy
(C) Adsorption energy
(D) Kinetic energy
The equation for Freundlich adsorption isotherm is: [BSEB, 2017 C] [Exam Year 2026]
(A) $x/m = kP^{1/n}$
(B) $x/m = kP^n$
(C) $x/m = k + P$
(D) $x/m = k/P$
Activated charcoal is used in gas masks because: [Exam Year 2026]
(A) It produces oxygen
(B) It adsorbs poisonous gases
(C) It removes odor
(D) It is cold
Coconut charcoal is used for: [Exam Year 2026]
(A) Water purification
(B) Separation of noble gases
(C) As fuel
(D) None of these
If the critical temperature of a gas is high, its adsorption will be: [Exam Year 2026]
(A) More
(B) Less
(C) Not affected
(D) Zero
TOPIC 2: Catalysis & Enzymes
Which enzyme is used in the hydrolysis of starch? [BSEB, 2022 A] [Exam Year 2026]
(A) Maltase
(B) Zymase
(C) Invertase
(D) Diastase
The catalyst used in the ‘Lead Chamber’ process is: [Exam Year 2026]
(A) $N_2O$
(B) $MnO_2$
(C) $H_2SO_4$
(D) $HNO_3$
A catalyst is a substance which: [BSEB, 2017 A] [Exam Year 2026]
(A) Increases the concentration of product
(B) Changes the equilibrium constant
(C) Shortens the time to reach equilibrium
(D) Supplies energy to the reaction
What is an Enzyme? [BSEB, 2017 A] [Exam Year 2026]
(A) Carbohydrate
(B) Lipid
(C) Protein
(D) Metalloid
The scientist who first explained catalysis was: [Exam Year 2026]
(A) Scheele
(B) Priestley
(C) Lavoisier
(D) Berzelius
Which catalyst is used in the hydrogenation of oils? [BSEB, 2018 A] [Exam Year 2026]
(A) $Pt$
(B) $Ni$
(C) $Mo$
(D) $V_2O_5$
Urease is an example of: [Exam Year 2026]
(A) Acid-base catalyst
(B) A colloid
(C) An enzyme
(D) A detergent
The catalyst used to convert oil into fat is: [Exam Year 2026]
(A) $PbO_2$
(B) $MnO_2$
(C) $Ni$
(D) $CrO_2$
Which catalyst is used in the manufacture of $NH_3$ by Haber’s process? [BSEB, 2016 A] [Exam Year 2026]
(A) $Fe + Mo$
(B) $Ni$
(C) $Pt$
(D) $V_2O_5$
A Negative Catalyst is one which: [Exam Year 2026]
(A) Increases the velocity
(B) Decreases the velocity
(C) Decreases activation energy
(D) Changes equilibrium
What is called a Biological catalyst? [Exam Year 2026]
(A) Carbohydrate
(B) Enzyme
(C) Fat
(D) Vitamin
A shape-selective catalyst is: [Exam Year 2026]
(A) $V_2O_5$
(B) ZSM-5
(C) $Pt$
(D) $Ni$
The mechanism of enzyme action is based on which theory? [Exam Year 2026]
(A) Adsorption theory
(B) Lock and Key theory
(C) Diffusion theory
(D) None of these
Which enzyme is used in the inversion of cane sugar? [Exam Year 2026]
(A) Invertase
(B) Zymase
(C) Diastase
(D) Urease
Zeolite is used: [Exam Year 2026]
(A) In water softening
(B) As a catalyst
(C) Both (A) and (B)
(D) None of these
The role of a Catalyst Poison in a reaction is: [Exam Year 2026]
(A) Increase activity
(B) Decrease activity
(C) Increase product
(D) Supply energy
Zeolite used to convert alcohol into gasoline is: [Exam Year 2026]
(A) ZSM-5
(B) $MnO_2$
(C) $Fe$
(D) $V_2O_5$
An example of homogeneous catalysis is: [Exam Year 2026]
(A) Haber’s process
(B) Lead chamber process
(C) Contact process
(D) Hydrogenation of oils
A positive catalyst _________ the activation energy: [Exam Year 2026]
(A) Increases
(B) Decreases
(C) Makes zero
(D) Keeps unchanged
The enzyme in gastric juice that helps digest food is: [Exam Year 2026]
(A) Pepsin
(B) Ptyalin
(C) Zymase
(D) Maltase
TOPIC 3: Colloidal State & Classification
Milk is an example of: [BSEB, 2021 A] [Exam Year 2026]
(A) Gel
(B) Sol
(C) Suspension
(D) Emulsion
Which of the following forms a colloidal solution in water? [BSEB, 2014 A] [Exam Year 2026]
(A) Salt
(B) Glucose
(C) Starch
(D) Barium nitrate
A colloidal sol is: [Exam Year 2026]
(A) True solution
(B) Suspension
(C) Heterogeneous sol
(D) Homogeneous sol
Which of the following is a Lyophilic colloid? [BSEB, 2024 A] [Exam Year 2026]
(A) Milk
(B) Gum
(C) Fog
(D) Blood
The range of the size of colloidal particles (Diameter) is: [BSEB, 2013 A] [Exam Year 2026]
(A) 1 nm to 1000 nm
(B) More than 1000 nm
(C) Less than 0.1 nm
(D) None of these
Fog is an example of: [BSEB, 2023 A] [Exam Year 2026]
(A) Dispersion of liquid in gas
(B) Dispersion of gas in liquid
(C) Dispersion of solid in gas
(D) Dispersion of liquid in liquid
Which of the following is NOT a colloidal solution? [Exam Year 2026]
(A) Water
(B) Milk
(C) Gum
(D) Smoke
In Foam or Froth, the dispersed phase and medium are: [Exam Year 2026]
(A) Gas in solid
(B) Gas in liquid
(C) Liquid in gas
(D) Solid in gas
If the dispersed phase is liquid and medium is solid, it is called: [Exam Year 2026]
(A) Sol
(B) Gel
(C) Emulsion
(D) Foam
The size of colloid particles (in cm) is between: [BSEB, 2022 A] [Exam Year 2026]
(A) $10^{-7} – 10^{-9}$
(B) $10^{-9} – 10^{-11}$
(C) $10^{-5} – 10^{-7}$
(D) $10^{-2} – 10^{-3}$
Cheese is an example of: [Exam Year 2026]
(A) Sol
(B) Gel
(C) Foam
(D) Emulsion
Which is a solid-solid colloidal system? [BSEB, 2016 C] [Exam Year 2026]
(A) Smoke
(B) Cake
(C) Synthetic gems
(D) Pumice stone
Cloud is an example of: [BSEB, 2019 A] [Exam Year 2026]
(A) Aerosol
(B) Gel
(C) Sol
(D) Emulsion
The size of suspension particles is: [Exam Year 2026]
(A) More than $10^{-5}$ cm
(B) Less than $10^{-7}$ cm
(C) $1 nm$
(D) $100 nm$
The dispersion medium in Butter is: [Exam Year 2026]
(A) Water
(B) Fat
(C) Milk
(D) Oil
The blue color of the sky is due to: [Exam Year 2026]
(A) Diffraction
(B) Scattering
(C) Refraction
(D) Reflection
Ultra-microscope is used for: [Exam Year 2026]
(A) True solution
(B) Colloidal particles
(C) Suspension
(D) Gas
Albumin (egg white) is which type of colloid? [Exam Year 2026]
(A) Lyophilic
(B) Lyophobic
(C) Associated
(D) Multimolecular
Smoke and Fog are both aerosols, but the difference is: [Exam Year 2026]
(A) Phase in fog is liquid, in smoke it is solid
(B) Fog is solid, smoke is liquid
(C) Both are gases
(D) No difference
Salt solution in water is: [Exam Year 2026]
(A) Colloid
(B) True solution
(C) Suspension
(D) Emulsion
TOPIC 4: Properties of Colloids (Tyndall, Brownian, Charge)
The charge found on blood is: [Exam Year 2026]
(A) Zero
(B) Negative
(C) Positive
(D) Neutral
Tyndall Effect is found in: [BSEB, 2021 A] [Exam Year 2026]
(A) Solution
(B) Precipitate
(C) Sol
(D) Vapor
Movement of colloidal particles under the influence of electric field is called: [Exam Year 2026]
(A) Dialysis
(B) Tyndall effect
(C) Emulsion
(D) Electrophoresis
The main cause of Brownian movement in colloidal solution is: [Exam Year 2026]
(A) Small size
(B) Charge
(C) Bombardment by molecules of medium
(D) Temperature
The most effective ion for coagulation of negative sol $As_2S_3$ is: [Exam Year 2026]
(A) $Na^+$
(B) $Mg^{2+}$
(C) $Al^{3+}$
(D) $Ba^{2+}$
An example of a positively charged sol is: [Exam Year 2026]
(A) Gold
(B) Gelatin
(C) $Fe(OH)_3$
(D) $As_2S_3$
The cause of Brownian movement is: [Exam Year 2026]
(A) Temperature fluctuation
(B) Charge on particles
(C) Collision of molecules of medium on colloidal particles
(D) Size
Tyndall effect is not found in: [BSEB, 2020 A] [Exam Year 2026]
(A) Sugar solution
(B) Gold solution
(C) Suspension
(D) Emulsion
Hardy-Schulze rule is related to: [BSEB, 2019 A] [Exam Year 2026]
(A) Oxidation
(B) Reduction
(C) Coagulation
(D) Adsorption
The confirmation of charge on sol particles is done by: [Exam Year 2026]
(A) Tyndall effect
(B) Electrophoresis
(C) Brownian motion
(D) Dialysis
Charge on colloidal particles is due to: [Exam Year 2026]
(A) Selective adsorption of ions
(B) Gain of electrons
(C) Friction
(D) Temperature
Gold Number is related to: [Exam Year 2026]
(A) Protective power
(B) Size
(C) Charge
(D) Weight
Coagulation power depends on: [Exam Year 2026]
(A) Size of ion
(B) Valency
(C) Color
(D) Density
Gold number is minimum for: [BSEB, 2011 A] [Exam Year 2026]
(A) Gelatin
(B) Albumin
(C) Gum
(D) Starch
Which motion prevents colloidal particles from settling down? [Exam Year 2026]
(A) Linear motion
(B) Brownian motion
(C) Vibrational motion
(D) Rotational motion
If Flocculation value is low, Coagulation power is: [Exam Year 2026]
(A) Low
(B) High
(C) Zero
(D) Same
To make Lyophobic sol stable, we add: [Exam Year 2026]
(A) Salt
(B) Protective colloid
(C) Solvent
(D) Acid
Low gold number of gelatin means: [Exam Year 2026]
(A) High protective power
(B) Low protective power
(C) Impure
(D) Neutral
The main cause of Delta formation is: [Exam Year 2026]
(A) Diffusion
(B) Coagulation
(C) Dialysis
(D) Tyndall effect
Alum cleans muddy water by: [Exam Year 2026]
(A) Absorption
(B) Coagulation
(C) Filtering
(D) Boiling
TOPIC 5: Emulsions & Micelles
Soap removes grease by: [Exam Year 2026]
(A) Adsorption
(B) Emulsification
(C) Coagulation
(D) Diffusion
Milk is: [BSEB, 2024 A] [Exam Year 2026]
(A) Fat in water
(B) Water in fat
(C) Oil in water
(D) Fat in fat
Substances that reduce the surface tension of water are called: [Exam Year 2026]
(A) Electrolytes
(B) Surfactants
(C) Catalysts
(D) Colloids
A colloidal solution of oil and water is called: [Exam Year 2026]
(A) Zeolite
(B) Micelle
(C) Emulsion
(D) Aerosol
Detergents are called: [Exam Year 2026]
(A) Surfactants
(B) Colloids
(C) Suspensions
(D) Gels
At CMC (Critical Micelle Concentration), particles: [Exam Year 2026]
(A) Solubilize
(B) Precipitate
(C) Form micelles
(D) Evaporate
Micelle formation occurs only when temperature is: [Exam Year 2026]
(A) Lower than Kraft temperature
(B) Higher than Kraft temperature ($T_k$)
(C) $0^{\circ}C$
(D) $100^{\circ}C$
The main role of an Emulsifier is: [Exam Year 2026]
(A) To make unstable
(B) To make stable
(C) Change color
(D) Remove odor
An example of micelle is: [Exam Year 2026]
(A) Sodium Stearate
(B) Urea
(C) Sucrose
(D) Benzene
Method for testing emulsion is: [Exam Year 2026]
(A) Dye test
(B) Dilution test
(C) Conductivity test
(D) All of the above
TOPIC 6: Purification & Applications
A solution that passes through animal membrane is: [Exam Year 2026]
(A) True solution
(B) Suspension
(C) Colloidal solution
(D) Precipitate
Purification of blood is done by which method? [Exam Year 2026]
(A) Coagulation
(B) Dialysis
(C) Peptization
(D) Filtration
Method for purification of colloidal solution is: [Exam Year 2026]
(A) Peptization
(B) Coagulation
(C) Dialysis
(D) Flocculation
Ultra-filtration is used for: [Exam Year 2026]
(A) Preparation of colloid
(B) Purification of colloid
(C) Coagulation
(D) Diffusion
Why is gelatin added to ice cream? [Exam Year 2026]
(A) For taste
(B) To prevent crystal formation (Stabilize)
(C) For sweetness
(D) For color
What is used for artificial rain? [Exam Year 2026]
(A) $NaCl$
(B) $AgI$
(C) $FeCl_3$
(D) $CuSO_4$
Peptization is a process in which: [Exam Year 2026]
(A) Impurities are removed
(B) Precipitate is converted into sol
(C) Sol is coagulated
(D) Boiling
Cottrell Precipitator is used for: [Exam Year 2026]
(A) Water purification
(B) Removing carbon particles from smoke
(C) Making milk
(D) Causing rain
Which property of colloidal solution depends on number of particles? [Exam Year 2026]
(A) Tyndall effect
(B) Brownian motion
(C) Osmotic Pressure
(D) Charge
$FeCl_3$ is used to stop bleeding because: [Exam Year 2026]
(A) It thins the blood
(B) $Fe^{3+}$ ions coagulate the blood
(C) It is red
(D) It is cold
TOPIC 7: Miscellaneous & Mixed (101-150)
Silver Iodide acts as seeds for artificial rain because: [Exam Year 2026]
(A) It absorbs water
(B) Its structure is similar to ice
(C) It is cheap
(D) It is a gas
Number of layers in physical adsorption is: [Exam Year 2026]
(A) One
(B) Two
(C) Multimolecular
(D) Zero
During adsorption, $\Delta H$ is always: [Exam Year 2026]
(A) Positive
(B) Negative
(C) Zero
(D) Constant
Physical state of homogeneous catalyst: [Exam Year 2026]
(A) Is same as reactant
(B) Is different from reactant
(C) Is always solid
(D) Is always gas
What is the unit of Gold Number? [Exam Year 2026]
(A) Milligram (mg)
(B) Gram (g)
(C) Milliliter (ml)
(D) No unit
The medium in Aerosol is: [Exam Year 2026]
(A) Solid
(B) Liquid
(C) Gas
(D) Water
What happens when charge on colloidal particles is destroyed? [Exam Year 2026]
(A) They become smaller
(B) They get precipitated (coagulated)
(C) They disappear
(D) Color changes
According to Hardy-Schulze rule, order of coagulation power of $Al^{3+}, Ba^{2+}, Na^+$ is: [Exam Year 2026]
(A) $Na^+ > Ba^{2+} > Al^{3+}$
(B) $Al^{3+} > Ba^{2+} > Na^+$
(C) $Ba^{2+} > Al^{3+} > Na^+$
(D) All same
A Lyophobic colloid is: [Exam Year 2026]
(A) Gelatin
(B) Gum
(C) Sulphur sol
(D) Starch
Which surface chemistry phenomenon is involved in cleaning action of soap? [Exam Year 2026]
(A) Absorption
(B) Micelle formation
(C) Coagulation
(D) Dialysis
Enzyme activity is maximum at which temperature? [Exam Year 2026]
(A) $0^{\circ}C$
(B) Optimum temperature ($37^{\circ}C$)
(C) $100^{\circ}C$
(D) $500^{\circ}C$
What does the intercept represent in Freundlich graph $\log x/m$ vs $\log P$? [Exam Year 2026]
(A) $k$
(B) $\log k$
(C) $1/n$
(D) $P$
Which of the following is a Hydrophilic colloid? [Exam Year 2026]
(A) Ferric hydroxide
(B) Gold sol
(C) Gum
(D) Arsenic sulphide
Condition for increasing adsorption of gas on solid is: [Exam Year 2026]
(A) Low Temp, High Pressure
(B) High Temp, Low Pressure
(C) Both high
(D) Both low
Which is NOT an example of Gel? [Exam Year 2026]
(A) Cheese
(B) Butter
(C) Boot polish
(D) Milk
Catalyst poison works by which process? [Exam Year 2026]
(A) Adsorption
(B) Absorption
(C) Diffusion
(D) Decomposition
Alum is effective in cleaning muddy water because Alum: [Exam Year 2026]
(A) Dissolves mud
(B) Coagulates mud particles
(C) Makes water sweet
(D) Bleaches color
What is Desorption? [Exam Year 2026]
(A) Accumulation of particles on surface
(B) Removal of adsorbed particles from surface
(C) Particles going inside
(D) Boiling
An example of Multimolecular colloid is: [Exam Year 2026]
(A) Gold sol
(B) Starch
(C) Rubber
(D) Soap
An example of Associated colloid is: [Exam Year 2026]
(A) Protein
(B) Soap
(C) Gum
(D) Silver sol
Heat of adsorption for physical adsorption is: [Exam Year 2026]
(A) 20-40 kJ/mol
(B) 80-240 kJ/mol
(C) 500 kJ/mol
(D) 0 kJ/mol
Heat of adsorption for chemical adsorption is: [Exam Year 2026]
(A) 20-40 kJ/mol
(B) 80-240 kJ/mol
(C) Very low
(D) Zero
Which enzyme converts glucose into ethyl alcohol? [Exam Year 2026]
(A) Invertase
(B) Zymase
(C) Maltase
(D) Diastase
Rubber is a colloidal solution of: [Exam Year 2026]
(A) Solid in water
(B) Liquid in water
(C) Solid in benzene
(D) Water in latex
Why is Electro-dialysis used? [Exam Year 2026]
(A) To speed up the process
(B) To change color
(C) To make colloid
(D) To destroy charge
Substance used in peptization is called: [Exam Year 2026]
(A) Coagulant
(B) Peptizing agent
(C) Poison
(D) Catalyst
Jam and Jelly are examples of: [Exam Year 2026]
(A) Sol
(B) Gel
(C) Emulsion
(D) Aerosol
Average molecular mass of colloidal particles is calculated by: [Exam Year 2026]
(A) Osmotic pressure
(B) Vapor pressure
(C) Boiling point
(D) Diffusion
Which ion will coagulate positive sol fastest? [Exam Year 2026]
(A) $PO_4^{3-}$
(B) $SO_4^{2-}$
(C) $Cl^-$
(D) $Na^+$
CMC value for soap is approximately: [Exam Year 2026]
(A) $10^{-4}$ to $10^{-3}$ mol/L
(B) $10^{-10}$ mol/L
(C) 1 mol/L
(D) 10 mol/L
An example of an Adsorbent is: [Exam Year 2026]
(A) Silica gel
(B) Activated charcoal
(C) Alumina
(D) All of these
An example of Heterogeneous catalysis is: [Exam Year 2026]
(A) Contact process for $H_2SO_4$
(B) Hydrolysis of ester
(C) Lead chamber process
(D) None
The nature of an enzyme is: [Exam Year 2026]
(A) Acidic
(B) Basic
(C) Colloidal
(D) Solid
Clotting of blood is a process of: [Exam Year 2026]
(A) Dialysis
(B) Coagulation
(C) Peptization
(D) Adsorption
Which emulsifier (stabilizer) is present in milk? [Exam Year 2026]
(A) Lactose
(B) Casein
(C) Glucose
(D) Fat
Two types of emulsion are: [Exam Year 2026]
(A) O/W and W/O
(B) O/S and S/O
(C) W/S and S/W
(D) None
Inversion of sugar is done by which enzyme? [Exam Year 2026]
(A) Maltase
(B) Invertase
(C) Pepsin
(D) Ptyalin
Best way to purify colloidal solution is: [Exam Year 2026]
(A) Filtration
(B) Dialysis
(C) Heating
(D) Cooling
Which of the following is a natural colloid? [Exam Year 2026]
(A) $NaCl$ solution
(B) Urea solution
(C) Blood
(D) Cane juice
Alloys are examples of: [Exam Year 2026]
(A) Solid sol
(B) Gel
(C) Emulsion
(D) Aerosol
Unit of surface energy is: [Exam Year 2026]
(A) $J/m^2$
(B) $J/m$
(C) $N/m$
(D) $W/m$
Activation energy required for chemical adsorption is: [Exam Year 2026]
(A) Very low
(B) Very high
(C) Zero
(D) Moderate
Tyndall cone value in colloidal system depends on: [Exam Year 2026]
(A) Size of particles
(B) Wavelength of light
(C) Both (A) and (B)
(D) Only temperature
Lyophilic colloids are more stable than lyophobic because: [Exam Year 2026]
(A) They are smaller
(B) They are heavier
(C) Their particles are solvated
(D) They are cheap
Which catalyst acts as a Promoter in ammonia synthesis? [Exam Year 2026]
(A) $Mo$ (Molybdenum)
(B) $Fe$
(C) $Pt$
(D) $V_2O_5$
Example of surface active agent is: [Exam Year 2026]
(A) Soap
(B) Dishwasher
(C) Shampoo
(D) All of these
What happens when light is passed through colloidal solution? [Exam Year 2026]
(A) Light is absorbed
(B) Light is scattered (Tyndall Effect)
(C) Light passes straight
(D) Light bends
Method to destroy emulsion is: [Exam Year 2026]
(A) Boiling
(B) Centrifugation
(C) Adding electrolyte
(D) All of the above
Used to measure charge on colloidal particles: [Exam Year 2026]
(A) Zeta Potential
(B) Boiling point
(C) Vapor pressure
(D) Density
Main application of surface chemistry is: [Exam Year 2026]
(A) Gas mask manufacture
(B) Paint and dye industry
(C) Absorption of medicines
(D) All of these
Bihar Board Class 12th के (Chemistry/रसायन विज्ञानं ) = रसायन विज्ञानं ‘भाग-1 (Englsih Medium) Book Chapter-5 Surface Chemistry के Exam 2027 MCQs Questions Answer Key
| Q. No. | Ans | Q. No. | Ans | Q. No. | Ans | Q. No. | Ans |
| 1 | (B) | 39 | (B) | 77 | (B) | 115 | (D) |
| 2 | (A) | 40 | (A) | 78 | (A) | 116 | (A) |
| 3 | (B) | 41 | (D) | 79 | (B) | 117 | (B) |
| 4 | (D) | 42 | (C) | 80 | (B) | 118 | (B) |
| 5 | (A) | 43 | (C) | 81 | (B) | 119 | (A) |
| 6 | (D) | 44 | (B) | 82 | (A) | 120 | (B) |
| 7 | (B) | 45 | (A) | 83 | (B) | 121 | (A) |
| 8 | (A) | 46 | (A) | 84 | (C) | 122 | (B) |
| 9 | (D) | 47 | (A) | 85 | (A) | 123 | (B) |
| 10 | (B) | 48 | (B) | 86 | (C) | 124 | (A) |
| 11 | (B) | 49 | (B) | 87 | (B) | 125 | (A) |
| 12 | (B) | 50 | (C) | 88 | (B) | 126 | (B) |
| 13 | (B) | 51 | (B) | 89 | (A) | 127 | (B) |
| 14 | (D) | 52 | (C) | 90 | (D) | 128 | (A) |
| 15 | (B) | 53 | (A) | 91 | (A) | 129 | (A) |
| 16 | (C) | 54 | (A) | 92 | (B) | 130 | (A) |
| 17 | (A) | 55 | (B) | 93 | (C) | 131 | (D) |
| 18 | (B) | 56 | (B) | 94 | (B) | 132 | (A) |
| 19 | (B) | 57 | (B) | 95 | (B) | 133 | (C) |
| 20 | (A) | 58 | (A) | 96 | (B) | 134 | (B) |
| 21 | (D) | 59 | (A) | 97 | (B) | 135 | (B) |
| 22 | (A) | 60 | (B) | 98 | (B) | 136 | (A) |
| 23 | (C) | 61 | (B) | 99 | (C) | 137 | (B) |
| 24 | (C) | 62 | (C) | 100 | (B) | 138 | (B) |
| 25 | (D) | 63 | (D) | 101 | (B) | 139 | (C) |
| 26 | (B) | 64 | (C) | 102 | (C) | 140 | (A) |
| 27 | (C) | 65 | (C) | 103 | (B) | 141 | (A) |
| 28 | (C) | 66 | (C) | 104 | (A) | 142 | (B) |
| 29 | (A) | 67 | (C) | 105 | (A) | 143 | (C) |
| 30 | (B) | 68 | (A) | 106 | (C) | 144 | (C) |
| 31 | (B) | 69 | (C) | 107 | (B) | 145 | (A) |
| 32 | (B) | 70 | (B) | 108 | (B) | 146 | (D) |
| 33 | (B) | 71 | (A) | 109 | (C) | 147 | (B) |
| 34 | (A) | 72 | (A) | 110 | (B) | 148 | (D) |
| 35 | (C) | 73 | (B) | 111 | (B) | 149 | (A) |
| 36 | (B) | 74 | (A) | 112 | (B) | 150 | (D) |
| 37 | (A) | 75 | (B) | 113 | (C) | ||
| 38 | (B) | 76 | (B) | 114 | (A) |
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