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The heat of neutralisation of HCl by NaO...

The heat of neutralisation of HCl by NaOH is-55.9 kJ/mol. If the heat of neutralisation of HCN by NaOH is -12.1 kJ/mol. The energy of disso-ciation of HCN is:

A

`-43.8 kJ`

B

43.8kJ

C

68 kJ

D

`-68 kJ`

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The correct Answer is:
B
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