Surface Chemistry Quiz-14

Surface Chemistry Quiz-14

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.  Which one of the following methods, does not give the sol?

•   Electrophoresis
•   Peptization
•   Electrodispersion
•   Solvent exchange

Solution

Q2.  Which is not a macromolecule?

•   Palmitate
•   Starch
•   DNA
•   Insulin

Solution
Palmitate is an anion and not a macromolecule.

Q3.  Physical adsorption increases when

•   Temperature increases
•   Temperature decreases
•   Temperature remains constant
•   Temperature increases above 60℃

Solution

Q4.  Associated colloid among the following is

•   Enzyme
•   Proteins
•   Cellulose
•   Sodium stearate

Solution
Sodium stearate is an example of associated colloids. Colloidal solution of enzymes, proteins, cellulose and starch are the examples of macromolecular colloids.

Q5. The coagulation of sol particles or sol destruction may be brought in by :

•   Cataphoresis
•   Adding oppositively charged sol
•   Adding electrolyte
•   All of the above

Solution
  Each one brings in neutralization of charges on sol particles.

Q6.  A catalyst :

•   Alter the reaction mechanism
•   Decreases the activation energy
• Increases collision frequency
•   Increases the average kinetic energy of reacting species

Solution
Catalyst shows exothermic adsorption of reactant molecules and thus, energy of activation is lowered.

Q7. Which of the following reaction is an example for homogeneous catalysis?

•   
  
  
•  
  
  
•  
  
  
•  

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

In this reaction both reactant and catalyst are in the gaseous phase. 

Q8. The potential difference between the fixed charged layer and the diffused layer having opposite charge is called :

•   Zeta potential
•   Streaming potential
•   Dorn potential
•   Colloidal potential

Solution
The definition of Zeta potential.

Q9. Hydrolysis of cane sugar is catalysed by :

•   H⁺
•   Mineral acids
•   Enzymes
•   All of these

Solution
H⁺ from weak acids or strong acids or enzyme’s invertase catalyse the hydrolysis of sugar.

Q10.  Which is not correct regarding the adsorption of a gas on surface of a solid?

•   Enthalpy and entropy change is negative
•   Adsorption is more for some specific substance
•   On increasing temperature, adsorption increase progressively
•    It is a reversible reaction

Solution