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Heat of Formation

If the bond d...

Question

If the bond dissociation energies of XY, $X_{2}$ and $Y_{2}$ (all diatomic molecules) are in the ratio of $1 : 1 : 0.5$ and $Δ_{f} H$ for the formation of XY is $- 200$ kJ $m o l^{- 1}$ . The bond dissociation energy of $X_{2}$ will be:

A

200

kJ

m o l^{- 1}

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B

100

kJ

m o l^{- 1}

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C

800

kJ

m o l^{- 1}

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D

300

kJ

m o l^{- 1}

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Solution

The correct option is B $800$ kJ $m o l^{- 1}$

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