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Heat of neutralisation is least when...

Heat of neutralisation is least when

A

NaOH is neutralised by `CH_(3)COOH`

B

NaOH is neutralised by HCl

C

`NH_(4)OH` is neutralised by `CH_(3)COOH`

D

`NH_(4)OH` is neutralised by `HNO_(3)`

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The correct Answer is:
C
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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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