The enthalpy of neutralisation of HCl by NaOH is −57.1 kJ mol⁻¹ and that of HCN by NaOH is −12.1 kJ mol⁻¹. The enthalpy of ionization of HCN is:
- A−69.2 kJ
- B−45.0 kJ
- C69.2 kJ
- D45.0 kJ
✓ Correct answer: D
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