Statement (b) is incorrect. The corrected statement is : At around 2000 K, the dissociation of dihydrogen into its atoms is only ~ 0.081%. Bond dissociation enthalpy of H2 molecule is highest due to very strong attraction between the atoms. Zn+2HCl→H2+ZnCl2 Zn+NaOH→Na2ZnO2+H2 H—H bond dissociate by increasing temperature and shining UV light.