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Bond Order and Enthalpy

In which of t...

Question

In which of the following oxygen-oxygen bond dissociation energy is minimum?

{N a}_{2} O_{2}

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O_{2}

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{K O}_{2}

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Same in all of the above

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Solution

The correct option is A ${N a}_{2} O_{2}$
As we know, bond dissociation energy is the energy required to break a bond. Since, $N a_{2} O_{2}$ has a sigma bond between the oxygen atoms, the energy required to break the bond will be less than the energy required to break the bond between oxygen atoms in $K O_{2}$ and $O_{2}$ which contain sigma as well as pi bonds.

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