Chemisorption is a type of adsorption in which the adsorbate molecules bond chemically with the surface of the adsorbent. It involves the formation of chemical bonds between the adsorbate and the adsorbent. Chemisorption is different from physisorption, which involves weak van der Waals forces or dipole-dipole interactions.

The true statement about chemisorption is:

c) It is highly specific in nature

Explanation:

High Specificity:
Chemisorption is highly specific in nature because it requires a specific type of adsorbent and adsorbate. The adsorbent surface must have active sites or functional groups that can form chemical bonds with the adsorbate molecules. The adsorbate molecules must also have a specific chemical structure or reactivity that allows them to bond with the adsorbent. This specificity is due to the requirement for chemical bonding, which is highly specific and selective.

Reversibility:
Unlike physisorption, chemisorption is generally not reversible. In physisorption, the adsorbate molecules are held onto the surface of the adsorbent by weak intermolecular forces, which can be easily overcome by changing the temperature or pressure. However, in chemisorption, the adsorbate molecules are bonded to the surface through chemical bonds, which are much stronger and more stable. Breaking these chemical bonds typically requires higher temperatures or chemical reactions, making chemisorption less reversible.

Temperature:
Chemisorption can occur at any temperature, not necessarily low temperature. The rate of chemisorption may vary with temperature, but it can occur at both low and high temperatures, depending on the specific adsorbent-adsorbate system.

In conclusion, chemisorption is highly specific in nature due to the requirement for chemical bonding. It is generally not reversible like physisorption. The temperature at which chemisorption occurs can vary depending on the specific system.