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The correct statement(s) pertaining to t...

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)

A

Adsorption is always exothermic.

B

Physisorption may transform into chemisorption at high temperature.

C

Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.

D

Chemisorption is more exothermic than physisorption, however, it is very slow due to higher energy of activation.

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
a. adsorption is always exothermic (factual statement).
b. It is also a factuaal statement.
The statement is wrong. Physisorption decreases with increases in temperature. But chemisorption first increases with increases in temperature and then decreases. The effect is called activated adsorption.

d. It is a factual statement.
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Select the set having correct statements pertaining to the adsorption of a gas on a solid surface (1) physisortion may transform into chemisorption at high temperature (2) chemisorption is more exothermic than physisortion , however it is very slow due to higher energy of activation (3) Adsorption is always exothermic (4) Physiosorption increase with increasing temperature but chemisorption decreases with increasing temperature

Knowledge Check

  • The correct statement(s) pertiaining to the adsorption of a gas on a solid surface is (are)

    A
    Adsorption is always exothermic
    B
    Physisorption may transform into chemisorption at high temperature
    C
    Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature
    D
    Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation.

  • The incorrect statement pertaining to the adsorption of a gas on a solid surface is :

    A
    Adsorption is always exothermic
    B
    Physisorption may transform into chemisorption at high temperature
    C
    Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature
    D
    Chemisorption is more exothermic than physisorption ,however, it is very slow due to higher energy of activation

  • The correct statements pertaining to the adsorption of a gas on a solid surface are (i) Adsorption is always exothermic (ii) Physisorption may transform into chemisorption at high temperature (iii) Physisorption increases with increasing temperature but chemisorotion decrease with increasing temperature (iv) Chemisorption is more exothermic than physisoption, however, it is very slow due to higher energy of activation

    A
    `(i),(ii),(iii),(iv)`
    B
    `(ii),(iii),(iv)`
    C
    `(i),(iii)`
    D
    `(ii),(iv)`

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