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Question

In which of the following neutralisation reactions, the heat of neutralisation will be highest?

A
HCl and NaOH
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B
CH3COOH and NaOH
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C
CH3COOH and NH4OH
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D
HCl and NH4OH
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Solution

The correct option is A HCl and NaOH
The heat of neutralisation will be highest for the reaction involving strong acid as well as strong base.
Since, CH3COOH is a weak acid and NH4OH is a weak base so the options B,C,D will not have maximum heat of neutralisation, while in option A both HCl and NaOH are strong so it will have highest heat of neutralisation.
Hence, answer is option A.

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