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The heat of neutralization of HCl by NaOH under certain condition is `-55.9` kJ and that of HCN by NaOHis `-12.1` kJ. The heat of ionization of HCN is
A. `-68.0 kJ mol^(-1)`
B. `-43.8 kJ mol^(-1)`
C. 68.0 kJ `mol^(-1)`
D. 43.8 kJ `mol^(-1)`

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