Surface Chemistry Quiz-5
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. Solvent hating colloids are :
Solution
Solvent hating sols are lyophobic or in other words dispersed phase has less affinity for solvent.
Solvent hating sols are lyophobic or in other words dispersed phase has less affinity for solvent.
Q2.
Solution
Soaps, surfactants, polymers and finely divided metal oxides and hydroxides are emulsifiers.
Soaps, surfactants, polymers and finely divided metal oxides and hydroxides are emulsifiers.
Q3. In a reversible reaction, the catalyst
Solution
A catalyst increases the rate of reaction by decreasing its activation energy. In a reversible reaction, catalyst decreases activation energies of both, forward and backward reactions, equally, thereby increasing rate of both reactions equally. Thus, equilibrium is approached quickly.
A catalyst increases the rate of reaction by decreasing its activation energy. In a reversible reaction, catalyst decreases activation energies of both, forward and backward reactions, equally, thereby increasing rate of both reactions equally. Thus, equilibrium is approached quickly.
Q4. Which of the following cannot form the micelles?
Solution
Sodium benzoate
Sodium benzoate
Q5.Alloy is an example of
Solution
Alloy is a mixture of two or more elements which has metallic properties. Brass is an alloy of Cu and Zn. Alloy is an example of solid sol. Some kinds of steel are alloys of Fe and C and can be considered as solid solutions in which carbon atoms are located in some of the space between iron atoms.
Alloy is a mixture of two or more elements which has metallic properties. Brass is an alloy of Cu and Zn. Alloy is an example of solid sol. Some kinds of steel are alloys of Fe and C and can be considered as solid solutions in which carbon atoms are located in some of the space between iron atoms.
Q6. Identify the correct statement for the adsorption of a real gas on charcoal at 1 atm and 15℃
Solution
Gases which have high critical temperature, have strong van der Waals’ forces of attraction and hence, are adsorbed to a greater extent.
Gases which have high critical temperature, have strong van der Waals’ forces of attraction and hence, are adsorbed to a greater extent.
Q7.A biological catalyst is
Solution
Enzymes are biological catalyst
Enzymes are biological catalyst
Q8.The substance that gets adsorbed on the surface of solid is called
Solution
The substance which gets adsorbed on the surface of solid is called adsorbate and the solid on which adsorption occurs is called adsorbent
The substance which gets adsorbed on the surface of solid is called adsorbate and the solid on which adsorption occurs is called adsorbent
Q9.Enzyme catalysts are :
Solution
One enzyme catalyses only one reaction. This is highly specific action of enzyme. Sucrose is hydrolysed by invertase whereas, another sugar maltose is hydrolysed by maltase.
One enzyme catalyses only one reaction. This is highly specific action of enzyme. Sucrose is hydrolysed by invertase whereas, another sugar maltose is hydrolysed by maltase.
Q10. Which of the following is the best protective colloid?
Solution
Protective power of colloid ∝ 1/gold number ∴ Gelatin has lowest gold number among given choices. ∴ Gelatin is best protective colloid.
Protective power of colloid ∝ 1/gold number ∴ Gelatin has lowest gold number among given choices. ∴ Gelatin is best protective colloid.
