Chemisorption:
A. Increase with temperature
B. Decrease with temperature
C. Remains unaffected by change of temperature
D. First increases and then decreases with temperature

Hint: A covalent or ionic link is formed between the surfaces of the adsorbent and the adsorbate during chemical adsorption, often referred to as chemisorption, on solid materials. The adsorption of hydrogen, nitrogen, etc. Chemisorption occurs when a substance is deposited at a high temperature on the surface of an adsorbent, such as a ferrous catalyst.

Complete Step by Step Solution:
Adsorption is referred to as chemisorption or chemical adsorption when chemical forces hold the gas molecules to the surface of the adsorbent. In this scenario, the adsorbate interacts chemically strongly with the unsaturated surface, producing a high heat of adsorption that is typically in the range of $400kJ$ per mole.

Chemisorption is frequently characterised by occurring at high temperatures and frequently being an active process.
It could be reactive, non-reactive, or dissociative in character.
Chemisorption typically takes place at high temperatures, however there are certain recorded instances where it takes place at low temperatures.
Due to its exothermic nature, chemisorption first increases with increasing temperature and then decreases.
Therefore, the correct answer is first increase and then decrease with temperature.
Hence, the correct option is (D).

Note: Points should be noted that, Changes in surface tension and cell consistency are also brought about by adsorption processes that take place on cell membranes. Poisons and drugs that have adsorption on cell surfaces work there to cause harm. Selective adsorption and focused action may be connected.