Assertion :The heat of neutralisation is constant for any strong acid and strong base reaction. Reason: Strong acids and strong bases will completely ionise at any concentration.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Strong acids and strong bases will completely ionise at any concentration
Strong acid $\to H^{+}$
Strong base $\to O H^{-}$
$H^{+}$ + $O H^{-} \to H_{2} O Δ H$
All strong acid and strong base consists of same equation.

Therefore heat of neutralisation is constant for any strong acid and strong base reaction.

Option A is correct.

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