Which of the following has the least bond energy ?

H_{2}

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M g_{2}

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F_{2}

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O_{2}^{2 -}

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Solution

The correct option is B $M g_{2}$
${M g}_{2}$ has least bond energy due to its large size as compared to other . It is second period while all others are first period elements so bond length of ${M g}_{2}$ is higher than others. Bond length is inversely proportional to bond energy. So ${M g}_{2}$ has least bond energy.

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