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Bond dissociation enthalpy of \( \mathrm{H}_{2}, \mathrm{Cl}_{2} \) and \( \mathrm{HCl} \) are 434,242 and \( 431 \mathrm{~kJ} \mathrm{~mol}^{-1} \) respectively. Enthalpy of formation of \( \mathrm{HCl} \) is
\( \mathrm{P} \)
(a) \( -93 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(b) \( 245 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(c) \( 93 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(d) \( -245 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(2008)
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