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Surface Chemistry Quiz-3

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. Freundlich equation for adsorption of gases (in amount of X g) on a solid(in amount of m g)at
constant temperature can be expressed as
  •  
  •  
  •  
  •  
Solution
According to Freundlich equation,


Q2.Shape selective catalysts are so called because of
  •  The shape of the catalyst
  •  The specificity of the catalyst
  •  The size of the pores of catalyst which can trap selective molecules only
  •  Their use for only some selected reaction
Solution
The size of the pores of catalyst which can trap selective molecules only

Q3.  Which of the following is incorrect for electrophoresis?
  •   In electrophoresis, solution migrates either to anode or to the cathode depending upon the positively or negatively charged solution
  •  Electrophoresis is a useful method for finding the charge of a solution
  •  Electrophoresis with a high potential is helpful in destroying an emulsion
  •  Colloids are uncharged particles and do not migrate towards the electrodes when electric field is applied
Solution
Colloids are uncharged particles and do not migrate towards the electrodes when electric field is applied

Q4. The Brownian movement is due to
  •  Enthalpy change during the formation of colloids
  •  Attractive forces between the colloidal particles and the molecules of dispersion medium
  •  The impact of molecules of the dispersion medium on the colloidal particles
  •  The movement of positively charged colloidal particle to negatively charged particle
Solution
The continuous rapid zig-zag motion by a colloidal particle in the dispersion medium is called Brownian movement

Q5.The curve showing the variation of adsorption with pressure at constant temperature is called
  •  An isostere
  •  Adsorption isotherm
  •  Adsorption isobar
  •  None of these
Solution
 The graph plotted between amount of substance adsorbed and on the given pressure at constant temperature is known as adsorption isotherm

Q6. Which is not lyophilic colloid?
  •  Milk
  •  Gum
  •  Fog
  •  Blood
Solution
Organic sols are usually lyophilic.

Q7.Catalyst in a reaction
  •  Lowers the activation energy
  •  Increase the rate of reaction
  •  Both (a) and (b)
  •  Initiates the reaction
Solution
A catalyst increases the rate of the reaction by decreasing its activation energy.

Q8.Which is an example of auto-catalyst?
  •  Hydrolysis of methyl acetate
  •  Decomposition of TNG
  •  Oxidation of oxalic acid by
  •  All of the above
Solution
for (a) ; mixture of gases for (b) andfor (c) formed during reaction acts as catalyst.

Q9.Which of the following is the most effective in the coagulation of gold sol?
  •  
  •   
  •  
  •  
Solution
Amongion has maximum valency, thus it will be the most 39 effective in the coagulation of gold sol

Q10. Which of the following is a lyophobic colloidal solution?
  •  Aqueous starch solution
  •  Aqueous protein solution
  •  Gold sol
  •  Polymer solutions in some organic solvents
Solution
Gold sol is a lyophobic sol. Gold particles have very less affinity towards dispersion medium, hence its sol can be easily coagulated.

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