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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 `HNO_(3)`

C

`NaOH` is neutralised by `HCl`

D

`NaOH` is neutralised by `H_(2)SO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta H` is least when weak acid or base in neutralized by weak base or acid, ww
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Assertion(A) : Heat of neutralisation is always less than zero. Reason(R ) : Neutralisation involves reactions between an acid and a base.

A: Enthalpy of neutralisation of 1 equivalent each of HCI and H_(2)SO_(4) with NaOh is same. R : Enthalpy of neutralisation is always the heat evolved when 1 mole acis is neutralised by a base.

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):

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. Which of the following statements are correct ? (1) DeltaH=DeltaU+DeltanRT (2) Heat changes measured by bomb calorimeter give change in heat enthalpy during the reaction. (3) DeltaH=DeltaU for the reaction : C_((s))+O_(2(g))rarr CO_(2(g)) (4) Heat of formation for C_(6)H_(6) can be directly measured.

Heat of neutralisation of HF is :

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