Assertion : $C + \frac{1}{2} O_{2} ⟶ C O; Δ H = - 26.0 k c a l$
$C O_{2} + \frac{1}{2} O_{2} ⟶ C O_{2}; Δ H = - 68.3 k c a l$
$C + O_{2} ⟶ C O_{2}; Δ H = - 94.3 k c a l$ Reason: This is an experimental proof of Hess's law.

Read the above assertion and reason and choose teh correct option regarding it.

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
Given below is an application of Hess's law and not an experimental proof. Hess's law has been verified theoretically.
$C + \frac{1}{2} O_{2} ⟶ C O; Δ H = - 26.0 k c a l$
$C O_{2} + \frac{1}{2} O_{2} ⟶ C O_{2}; Δ H = - 68.3 k c a l$
$C + O_{2} ⟶ C O_{2}; Δ H = - 94.3 k c a l$
Thus, Assertion is correct but Reason is incorrect.

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