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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

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The correct Answer is:
B
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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. The ratio of dissociation constant of two acids are: