Surface-Chemistry-Quiz-2

Surface Chemistry Quiz-2

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

Q1. In aerosol, the dispersion medium is

•  Solid
•  Liquid
•  Gas
•  Any of these

Solution
Aerosol is colloidal system of solid in gas. /e.g., smoke. So, dispersion medium in aerosol is gas.

Q2.Peptization involves

•  Precipitation of colloidal particles
•  Disintegration of colloidal aggregates
•  Evaporation of dispersion medium
•  Impact of molecules of the dispersion medium on the colloidal particles

Solution
Peptisation is a process in which freshly prepared precipitate disintegrates into colloidal solution

Q3.  Which of the following reactions lead to the formation of colloidal solution?

•  
•  
•  
•  

Solution

This equation is used for the preparation of sulphur sol

Q4. Colloidal solution commonly used in treatment of skin diseases is :

•  Colloidal sulphur
•  Colloidal silver
•  Colloidal gold
•  Colloidal antimony

Solution
Because of larger surface area in colloidal state, adsorption is more, also it acts as germ killer.

Q5.Which of the following forms cationic micelles above certain concentration?

•  Urea
•  Sodium dodecyl sulphate
•  Sodium acetate
•  Cetyltrimethylammonium bromide

Solution

 Alkyl trimethyl ammonium ions aggregates to form cationic micelles

Q6. According to Langmuir adsorption isotherm the amount of gas adsorbed at very high pressure :

•  Reaches a constant limiting value
•  Goes on increasing with pressure
• Goes on decreasing with pressure
•  Increases first and decreases later with pressure

Solution
Langmuir’s adsorption isotherm deals in terms of chemical adsorption which fails at high pressure because, the mass adsorbed reaches a constant value when the adsorbed surface is completely covered by a unimolecular layer of gases.

Q7.In homogeneous catalysis

•  The reactant, catalyst and products are in the same phase
•  The catalyst and reactants are in the same phase
•  The catalyst and products are in the same phase
•  The reactants and products are in the same phase

Solution
Homogenous catalysis:When the reactants and catalyst are in the same phase, the catalysis is known as homogeneous catalysis. 

Q8.The formation of colloid from suspension is

•  Peptisation
•  Condensation
•  Sedimentation
•  Fragmentation

Solution
The formation of colloid from suspension is called peptisation.The process of converting a precipitate (suspension) into colloidal particles by adding suitable electrolyte is known as peptisation.

Q9.Which reaction gives colloidal solution?

•  
•  
•  
•  

Solution
On passingthrough a cold solution of an oxidant, colloidal sulphur is formed.

Q10. The addition of 1% alcohol to chloroform acts as

•  Auto-catalyst
•  Bio-catalyst
•  Positive catalyst
• Negative catalyst

Solution
Negative catalyst