Assertion :Heat of neutralisation of strong acid and weak base is less than $57.1 k J$ Reason: It is because weak bases do not ionise completely in aqueous solution. Therefore, some energy is required for their complete ionisation and that is why net energy released is less.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
It is because weak bases do not ionise completely in aqueous solution. Therefore, some energy is required for their complete ionisation and that is why net energy released is less as in case of strong acid and strong base or strong base.
Hence, option A is correct

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Assertion :Heat of neutralisation of strong acid and weak base is less than 57.1kJ Reason: It is because weak bases do not ionise completely in aqueous solution. Therefore, some energy is required for their complete ionisation and that is why net energy released is less.

Assertion :Heat of neutralisation of strong acid and weak base is less than $57.1 k J$ Reason: It is because weak bases do not ionise completely in aqueous solution. Therefore, some energy is required for their complete ionisation and that is why net energy released is less.