Question

When $O_2$ is adsorbed on a metallic surface, electron transfer occurs from the metal to $O_2$. The TRUE statement(s) regarding this adsorption is(are)

• A. $O_2$ is physisorbed
• B. Heat is released
• C. Occupancy of ${\pi }_{2p}$ of $O_2$ is increased
• D. Bond length of $O_2$ is increased
  

Answer 1

Answer: (B), (C), (D)

The correct options are
B Heat is released
C Occupancy of ${\pi }_{2p}$ of $O_2$ is increased
D Bond length of $O_2$ is increased


When electron is transferred from metal to oxygen the bond is getting formed. Therefore, we consider it as chemisorption and hence heat will be released. Electron goes to ${\pi }_{2p}^{\ast }$ of $O_2$ so bond length increases.