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The heats of neutralisation of four acid...

The heats of neutralisation of four acids `a`, `b`, `c` and `d` when neutralised against a common base are `13.7`, `9.4`, `11.2` and `12.4` kcal respectively. The weakest among these acids is

A

`a`

B

`b`

C

`c`

D

`d`

Text Solution

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The correct Answer is:
B
`'B'` has least enthalpy of neutraliisation. It means acid is weakest as it required amount of energy.
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A solubility contains one mole each of HA and HB (both are weak acids) in one litre solution. Now 1 mole of NaOH is added to this solution so that both the acids are partly neutralised. Heat of neutralisation for HA and HB are- 11.8 and- 12.4 kcal respectively and the heat produced during partial neutralisation of HA and HB is- 12.25 kcal. pH of solution, if hydrolysis constant for A^(-) is 10^(-9) :

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DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
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  11. The units of entropy are

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  16. When a solid changes into liquid, the entropy

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