Write the differences between physisorption and chemisorption wi

Subject

Chemistry

Class

CBSE Class 12

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 Multiple Choice QuestionsShort Answer Type

1.

How many atoms constitute one unit cell of a face-centered cubic crystal? 

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2.

Name the method used for the refining of Nickel metal?

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3.

What is the covalency of nitrogen in N2O5

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4.

Arrange the following in increasing order of their basic strength in aqueous solution: 

 CH3NH2, (CH3)3N, (CH3)2NH

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5.

18 g of glucose, C6H12O6 (Molar Mass = 180 g mol-1) is dissolved in 1 kg of water in a saucepan. At what temperature will this solution boil? 

 (Kb for water = 0.52 K kg mol-1, boiling point of pure water = 373.15 K)

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6.

The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm-1. Calculate its molar conductivity?

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7.

Write the dispersed phase and dispersion medium of the following colloidal systems: 

 (i) Smoke (ii) Milk

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8.

What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?

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9.

Write the differences between physisorption and chemisorption with respect to the following:

(i) Specificity

(ii) Temperature dependence

(iii) Reversibility and

(iv) Enthalpy change


Chemisorption is a kind of  adsorption which involves a chemical reaction between the surface and the adsorbate.

Physiosorption, also called physical adsorption, is a process in which the electronic structure of the atom or molecule is barely perturbed upon adsorption.

 

 

S. No.

 

Point of difference

 

Physiosorption

 

Chemisorption

(i)

Specificity

This is not specific in nature.

This is highly specific in nature.

(ii)

Temperature dependence

Low temperature is favourable for physisorption. It decreases with increase in temperature.

High temperature is favourable for chemisorption. It increases with the increase in temperature.

(iii)

Reversibility

This is reversible in nature.

This is irreversible in nature.

(iv)

Enthalpy change

Enthalpy of adsorption is low.

Enthalpy of adsorption is high.

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10.

Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver? 

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