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Question

Heat of neutralisation of HCl by NaOH is 13.7 kcal per equivalent and by NH4OH is 12.27 kcal. The heat of dissociation of NH4OH is:

A
-25.97 kcal
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B
25.97 kcal
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C
-1.43 kcal
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D
1.43 kcal
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Solution

The correct option is D 1.43 kcal
Heat of dissociation of NH4OH+ heat of neutralisation by NH4OH= heat of neutralisation by NaOH
ΔHdiss+(12.27)=13.7
ΔHdiss=13.712.27
ΔHdiss=1.43 kcal

Option D is correct.

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