The two characteristics of Chemisorption are:
a) In Chemisorption the adsorbate and adsorbent get attached by covalent or ionic chemical bonds.
b) High activation energy and high temperature is also a favorable condition.
Final Answer: In Chemisorption the adsorbate and adsorbent get attached by covalent or ionic chemical bonds. High activation energy and high temperature is also a favorable condition.