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Which of the following gas molecules hav...

Which of the following gas molecules have minimum value of enthalpy of chemisorption on an iron surface?

A

`NH_(3)`

B

`H_(2)`

C

`CO`

D

`C_(2)H_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
Chemisorption is highly specific because it will only occur if there is some possitibility of chemical bonding between adsorbent and adsorbate. For example, oxygen is adsorbed on metals by virue of oxide formation. Dihydrogen gas (which is adsorbed by transition metals due to hydride formation) has minimum value of enthalpy of chemisorptions because it is neither polar (like `NH_(3),CO`) nor it has reactive `pi` bonds (like `C_(2)H_(4)`).
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