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Question

Assertion :Heat of neutralization for HF is -68.552 kJ/eq. where as for HCl it is -57.26 kJ/eq. Reason: The acid HF is weak acid.


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

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
The heat of neutralization for HF is -68.552 kJ/eq. whereas for HCl, it is -57.26 kJ/eq.
No doubt HF is weak acid but the higher values are due to extensive hydration of F ion being smallest anion (only H is smaller than F)
The acid HF is a weak acid.
Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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