Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Chemistry Surface Chemistry
Why gas masks are used by miners in coal mines while working?
Gas mask is used to adsorb poisonous gases since charcoal is a good
Why is adsorption always exothermic?
during adsorption surface energy is released as
Differentiate between adsorption and absorption?
adsorption is a surface phenomena wheras absorption is a bulk
What is the effect of temperature on adsorption of a gas on solid
Adsorption decreases with increase intemperature . because adsorption is an exothermic
liquid in liquid type colloids are known as .........
The movement of colloidal particle under an applied electrical field is called........
Milk is an........
(Gel, Aerosol, Emulsion, Solid sol)
What are the characteistics of enzyme catalysis?
Explain Hardy Schulze rule?
coagulating power of an ion increases with its
Differentiate homogeneous and heterogeneous catalysis.
If reactants and catalyst are in the same phase it is known as homogeneous catalysis.
If reactants and catalyst are in different phase it is known as
What are protective colloids?
Lyophobic colloids can be prevented from coagulation by adding lyophilic colloids and these lyophilic colloids are called protective
Describe the cleaning action of soap and detergents?
Write an example for macromolecular colloid?
Write any two differences between physisorption and chemisorption
1. Not specific 1. Highly
What is meant by associated colloid.Give an example
Colloid which behaves as normal strong electrolyte at lower concentration but exhibits colloidal properties at higher concentration...eg.
Define Brownian movement
The Zig -Zag movement of colloidal particles is known as Brownian
Name two adsorbents used for controlling humidity.
What is zetapotential ?
The potential difference between a fixed layer of one of kind of charges and diffused layer of opposite charges around a colloidal
The colour of finest gold sol is ...................
Briefly explain the reason for the stability of colloids
presence of similar charge on all particles prevents their aggregation and settling
also due to
Name two adsorption indicators?
fluorescein and eosin
What are the conditions of tyndall effect?
1) The size of the particle should not be much smaller than the wave length of light used
2) There should be a greater difference in the refractive indices
Match the following
Match the following