When FeCl3 solution is added to NaOH a negatively charged sol is obtained. It is due to the

(1) Presence of basic group

(2) Preferential adsorption of OH ions

(3) Self dissociation

(4) Electron capture by sol particles 

Subtopic:  Colloidal Solution |
 87%
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Graph between log x m and log P is a straight line inclined at an angle θ- 45°. When pressure of 0.5 atm and log k = 0.699, the amount of solute adsorbed per g of adsorbent will be

(1) 1 g/g adsorbent                             

(2) 1.5 g/g adsorbent

(3) 2.5 g/g adsorbent                           

(4) 0.25 g/g adsorbent

Subtopic:  Adsorption Isotherm |
 52%
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The stabilization of the dispersed phase in a lyophobic sol is due to

(1) The viscosity of the medium

(2) The surface tension of the medium

(3) Liking for the medium

(4) The formation of an electrical layer between the two phases

Subtopic:  Lyophilic & Lyophobic Sol |
 78%
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Which of the following reactions leads to the formation of a substance in colloidal state?

(A) 2HNO3+3H2S            3S+3H2O+2NO 

(B) SnCl2+HgCl2            SnCl4+Hg 

(C) 2Mg+CO2            2MgO+C

(D) Cu+CuCl2  HCl    Cu2Cl2

Subtopic:  Colloidal Solution |
 63%
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1 mol of AgII- can be coagulated by - 

1. 1 mol of Pb(NO3)2                          

2. \(\frac{1}{2}\) mol of Pb(NO3)2

3. \(\frac{2}{3}\) mol of Pb(NO3)2                           

4. None of the above.

Subtopic:  Colloidal Solution |
 53%
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The process of converting precipitate into collidal solution on adding an electrolyte is called:

(1) Peptisation                             

(2) Dialysis

(3) Electro-osmosis                     

(4) Eelectrophoresis

Subtopic:  Colloidal Solution |
 87%
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Assertion: Physical and chemical adsorption respond differently to a rise in temperature.

Reason: Chemical adsorption requires some activation energy.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Adsorption and Absorption |
 56%
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Assertion : Catalyst in general, in the form of finely divided powder.

Reason : Finer is the particle of a solid, greater is its surface area.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Catalyst |
 85%
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Assertion : The addition of ferric hydroxide sol to arsenic sulphide sol results in the precipitation

                   of both.

Reson : The colloidal particles in ferric hydroxide carry positive charge, whereas those in arsenic

             sulphide sol carry negative charge.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Colloidal Solution |
 82%
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Assertion: Lowering of temperature, increases the rate of physisorption.

Reason: Adsorption increases with an increase in temperature.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Adsorption and Absorption |
 63%
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