Question

From the given cells :
Lead storage cell, Mercury cell, Fuel cell and Dry cell
Answer the following.
(i) Which cell is used in hearing aids ?
(ii) Which cell was used in Apollo space programme ?
(iii) Which cell is used in automobiles and inverters ?
(iv) Which cell does not have a long life ?

Answer 1

1st — Mercury cell
2nd — Fuel cell
3rd — Lead storage cell
4th — Dry cell

Answer 2

Answer:

Physical Adsorption 

1. This is usually takes place at low temperature and decreases with increase in temperature.

2. The forces of attraction holding the adsorbate are Vander Waal’s forces

3. Heat of adsorption is low

4. It is reversible

5. It is not very specific

6. It forms multimolecular layer

7. It does not require any activation energy

Chemical Adsorption 

1. This takes place at high temperature

2. The forces of attraction holding the adsorbate are chemical bond forces

3.Heat of adsorption is high

4. It is irreversible

5. It is highly specific

6. It forms monomolecular layer

7. It requires activation energy.

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