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Chapter 5: Surface Chemistry

NCERT Solutions for CBSE Class 10 Chemistry — 16 solved questions with detailed explanations.

16

Questions

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Solved Questions

Q1. Physical adsorption is characterized by:

High activation energy
Strong chemical bonds
Low enthalpy of adsorption
Irreversibility

Difficulty: Easy · Topic: Adsorption

Solution

Physisorption: weak van der Waals forces, low enthalpy (20-40 kJ/mol), reversible, multilayer.

Q2. The Tyndall effect is shown by:

True solutions
Colloidal solutions
Suspensions
Pure solvents

Difficulty: Easy · Topic: Colloids

Solution

Tyndall effect: scattering of light by colloidal particles (1-1000 nm). Not seen in true solutions.

Q3. Fog is an example of:

gas in liquid
liquid in gas (aerosol)
liquid in liquid
solid in gas

Difficulty: Easy · Topic: Colloid Types

Solution

Fog = liquid in gas (aerosol).

Q4. Smoke is an example of:

solid in gas (aerosol)
gas in liquid
solid in liquid
liquid in gas

Difficulty: Easy · Topic: Colloid Types

Solution

Smoke = solid in gas (aerosol).

Q5. Milk is an example of:

gas in liquid
liquid in gas
solid in liquid
liquid in liquid (emulsion)

Difficulty: Easy · Topic: Colloid Types

Solution

Milk = liquid in liquid (emulsion).

Q6. Butter is an example of:

liquid in solid (gel)
liquid in liquid
solid in liquid
gas in liquid

Difficulty: Easy · Topic: Colloid Types

Solution

Butter = liquid in solid (gel).

Q7. Gem stones is an example of:

liquid in solid
solid in gas
gas in solid
solid in solid

Difficulty: Easy · Topic: Colloid Types

Solution

Gem stones = solid in solid.

Q8. Foam is an example of:

gas in liquid
gas in solid
solid in liquid
liquid in gas

Difficulty: Easy · Topic: Colloid Types

Solution

Foam = gas in liquid.

Q9. Pumice stone is an example of:

liquid in solid
solid in gas
gas in liquid
gas in solid

Difficulty: Easy · Topic: Colloid Types

Solution

Pumice stone = gas in solid.

Q10. An emulsion of oil in water is stabilized by:

Soap
Oil-soluble surfactant
Salt
Acid

Difficulty: Easy-Medium · Topic: Emulsions

Solution

Soap (sodium stearate) stabilizes oil-in-water emulsions; its hydrophilic head faces water and hydrophobic tail faces oil.

Q11. Chemisorption involves:

no energy change
chemical bond formation
van der Waals forces only
multilayer formation

Difficulty: Easy-Medium · Topic: Surface Chemistry

Solution

chemical bond formation.

Q12. Coagulation is the:

dissolution
settling of colloidal particles
formation of colloid
evaporation

Difficulty: Easy-Medium · Topic: Surface Chemistry

Solution

settling of colloidal particles.

Q13. Hardy-Schulze rule states that:

charge doesn't matter
higher valence ion causes faster coagulation
lower valence is better
only pH matters

Difficulty: Easy-Medium · Topic: Surface Chemistry

Solution

higher valence ion causes faster coagulation.

Q14. Gold sol is an example of:

associated colloid
lyophilic colloid
macromolecular colloid
lyophobic colloid

Difficulty: Easy-Medium · Topic: Surface Chemistry

Solution

lyophobic colloid.

Q15. Starch solution is:

suspension
lyophobic colloid
true solution
lyophilic colloid

Difficulty: Easy-Medium · Topic: Surface Chemistry

Solution

lyophilic colloid.

Q16. Brownian motion in colloids is due to:

gravity
magnetic field
electric field
bombardment by solvent molecules

Difficulty: Easy-Medium · Topic: Surface Chemistry

Solution

bombardment by solvent molecules.

Other Chapters in Chemistry

Ch 1: Solid State Ch 2: Solutions Ch 3: Electrochemistry Ch 4: Chemical Kinetics Ch 6: Isolation of Elements Ch 7: p-Block Elements Ch 8: d & f Block Elements Ch 9: Coordination Compounds Ch 10: Haloalkanes & Haloarenes Ch 11: Alcohols Phenols Ethers Ch 12: Aldehydes Ketones Ch 13: Amines Ch 14: Biomolecules Ch 15: Polymers Ch 16: Chemistry in Everyday Life

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