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Assertion: Heat given out during neutral...

Assertion: Heat given out during neutralisation of `NaOH` and `HF` is `-13.7 kcal//eq`.
Reason : `F^(-) ion` is more easily hydrated and thus heat of neutralisation of `HF` and `NaOH` is more.

A

If both the assertion and reason are true and reason is the true explanation of the assertion.

B

If both the assertion and reason are true but the reason is not the correct explanation of assertion.

C

If the assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
Heat given out during complete neutralisation of `HF` and `NaOH` is `-16.4 kcal//eq.` due to exetensive hydration of `F^(-)` on `NaF` account of its smaller size.
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Heat of neutralisation between HCI and NaOH is 13.7kcal and between HCN and NaOH is 3 kcal at 45^(@)C . Calculate the heat of ionisation of HCN

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Heat of neuralisation is amount of heat evolved or absorbed when 1g- equivalent of an acid reacts with 1g- equivalent of a base in dilute solution . If weak acid or weak bae are neutralised, the heat released during neutralisation is somewhat lesser than -13.7kcal or -57.27 kJ . Het of neutralisation is also referred as heat of formation of water from H^(+) and OH^(-) ions i.e., H^(+)+OH^(-) rarr H_(2)O, DeltaH=-13.7kcal. Heat of neutralisatio of HF and acetic acid respectively are ( in kcal):

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