Assertion :In a diatomic molecule involving two like atoms covalently bonded with each other, $B o n d e n e r g y = 2 \times h e a t o f f o r m a t i o n o f a t o m$ . Reason: $H_{2} ⟶ 2 H; Δ H_{H - - H} = Δ_{a} H$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In a diatomic molecule involving two like atoms covalently bonded with each other,
Bond energy $= 2 \times$ heat of formation of atom.
$H_{2} ⟶ 2 H; Δ H_{H - - H} = 2 Δ_{a} H$
Heat of formation of H atom $= Δ_{a} H = \frac{Δ H_{H - - H}}{2}$ .
The assertion is correct but the reason is incorrect

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