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The heat of neutralisation of HCl by NaOH -55.9kJ/mol,and that of HCN is -12.1 kJ , the energy of dissociation of HCN is

The heat of neutralisation of HCl by NaOH -55.9kJ/mol,and that of HCN is -12.1 kJ , the energy of dissociation of HCN is a) 43.8 kJ b)-43.8 kJ c) -68kJ d)68kJ

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