Definitions [5]
Define the term Electrophoresis.
The movement of colloidal particles under an applied electric potential is called electrophoresis.
Define the following term:
Multimolecular colloids
Multimolecular colloids are species having size in the colloidal range (diameter < 1 nm) that are formed by the aggregation of large number of atoms or small molecules of substances when dissolved in the dispersion medium.
Define the following term:
Coagulation
Coagulation is the process by which colloidal particles aggregate and settle as a precipitate. It is brought about by the addition of electrolyte.
Define coagulation.
It is a process of aggregating together the colloidal particles so as to change them into large-sized particles, which ultimately settle as a precipitate.
Define the following term:
Zeta potential
The potential difference between a colloidal particle's fixed layer (primary layer) and diffused layer (secondary layer) is known as the zeta potential. It's also referred to as electrokinetic potential.
Important Questions [69]
- Differentiate between the following: Adsorption and Absorption
- Give Reasons for the Following Observations : Nh3 Gas Adsorbs More Readily than N2 Gas on the Surface of Charcoal.
- Physisorption is Reversible While Chemisorption is Irreversible. Why ?
- Write the Differences Between Physisorption and Chemisorption with Respect to the Following
- Give Reasons for the Following Observations: Physisorption Decreases with Increase in Temperature.
- Write three differences between physisorption and chemisorption.
- How Does Chemisorption Vary with Temperature?
- Differentiate Between Adsorbtion and Absorption.
- How Does Chemisorption Vary with Temperature?
- What is the Effect of Temperature on Chemisorption ?
- Why is Adsorption Always Exothermic?
- Write One Similarity Between Physisorption and Chemisorption
- Give Reasons for the Following Observations : Powdered Substances Are More Effective Adsorbents.
- In Reference to Freundlich Adsorption Isotherm, Write the Expression for Adsorption of Gases on Solids in the Form of an Equation.
- Write One Difference in Homogeneous Catalysis and Heterogeneous Catalysis
- What is the Role of Promoters and Poisons in Catalysis?
- It is necessary to remove CO when ammonia is prepared by Haber's process.
- Write the Dispersed Phase and Dispersion Medium of Butter.
- Write the Dispersed Phase and Dispersion Medium of the Following Colloidal Systems: (i) Smoke (ii) Milk
- Co (G) and H2 (G) React to Give Different Products in the Presence of Different Catalysts. Which Ability of the Catalyst is Shown by These Reactions?
- Define the Following with a Suitable Example, of Each: Multimolecular Colloid
- Define the Following with a Suitable Example, of Each: Gel
- Write One Difference in the Following: Multimolecular Colloid and Associated Colloid
- Write One Difference Between Sol and Gel
- Write One Difference In Lyophobic Sol and Lyophilic Sol
- Give One Example Each of Lyophobic Sol and Lyophilic Sol.
- Give One Example Each of Sol and Gel.
- Write One Difference Between Multimolecular Colloid and Macromolecular Colloid
- Write One Difference Between O/W Emulsion and W/O Emulsion
- What Are Lyophilic and Lyophobic Colloids ? Which of These Sols Can Be Easily Coagulated on the Addition of Small Amounts of Electrolytes?
- Give Reasons for the Following Observations: Lyophilic Sol is More Stable than Lyophobic Sol.
- Define the following term: Multimolecular colloids
- Out of Sulphur Sol and Proteins, Which One Form Multimolecular Colloids?
- Define the following terms: Lyophilic colloid
- Differentiate between the following: Lyophobic Sol and Lyophilic Sol
- Write a Method by Which Lyophobic Colloids Can Be Coagulated.
- What Type of Colloid is Formed When a Gas is Dispersed in a Liquid? Give an Example
- Differentiate between the following: Multimolecular Colloid and Macromolecular colloid
- Write an Important Characteristic of Lyophilic Sols.
- Write the Chemical Method by Which Fe(Oh)3 Sol is Prepared from Fecl3.
- Define the Following with a Suitable Example, of Each: Coagulation
- What is Observed When an Emulsion is Centrifuged?
- Out of Starch and Ferric Hydroxide Sol, Which One Can Easily Be Coagulated and Why?
- What Happens When A Freshly Prepared Precipitate of Fe(Oh)3 is Shaken with a Small Amount of Fecl3 Solution?
- Define coagulation.
- State the Hardy-Schulze rule.
- What is electrophoresis?
- Define the Following Terms: Associated Colloids
- Define the following term: Zeta potential
- What Happens When An Emulsion is Centrifuged?
- What Happens When Persistent Dialysis of a Colloidal Solution is Carried Out?
- What is the Reason for the Stability of Colloidal Sols?
- Define the Following Term : Brownian Movement
- Give Reasons for the Following Observations: Leather Gets Hardened After Tanning.
- Define the following term: Coagulation
- Why a negatively charged sol is obtained when AgNO3 solution is added to KI solution?
- Out of BaCl2 and KCl, Which One is More Effective in Causing Coagulation of a Negatively Charged Colloidal Sol? Give Reason.
- Answer the Following Question. Why Are Medicines More Effective in the Colloidal State?
- A Colloidal Sol is Prepared by the Given Method in the Figure. What is the Charge on Hydrated Ferric Oxide Colloidal Particles Formed in the Test Tube? How is the Solution Represented?
- Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?
- A Colloidal Sol is Prepared by the Given Method in Figure. What is the Charge on Hydrated Ferric Oxide Colloidal Particles Formed in the Test Tube? How is the Sol Represented?
- Give Reasons for the Following Observations: Brownian Movement Provides Stability to the Colloidal Solution.
- What are emulsions?
- Give One Example Each of 'Oil in Water' and 'Water in Oil' Emulsion.
- What are the different types emulsions? Give one example of each type.
- What Are the Dispersed Phase and Dispersion Medium in Milk?
- Give Reasons for the Following Observations: Addition of Alum Purifies the Water
- Answer the Following Question. What is the Difference Between an Emulsion and a Gel?
- Based on the Type of Particles of Dispersed Phase, Give One Example Each of Associated Colloid and Multimolecular Colloid.
Concepts [21]
- Introduction of Adsorption
- Distinction Between Adsorption and Absorption
- Mechanism of Adsorption
- Types of Adsorption
- Adsorption Isotherms (Freundlich and Langmuir Adsorption Isotherm)
- Adsorption from Solution Phase
- Applications of Adsorption
- Homogeneous and Heterogeneous Catalysis
- Adsorption Theory of Heterogeneous Catalysis
- Shape-selective Catalysis by Zeolites
- Enzyme Catalysis
- Catalysts in Industry
- Colloids
- Classification Based on Physical State of Dispersed Phase and Dispersion Medium
- Classification Based on Nature of Interaction Between Dispersed Phase and Dispersion Medium
- Classification Based on Type of Particles of the Dispersed Phase, Multimolecular, Macromolecular and Associated Colloids
- Preparation of Colloids
- Purification of Colloidal Solutions
- Properties of Colloidal Solutions
- Emulsions
- Colloids Around Us
