Question

Enthalpy of formation of HF and HCl are 161 kJ and -92 kJ respectively. Which of the following statements is incorrect?
a) The affinity of fluorine for hydrogen is greater than the affinity of chlorine for hydrogen
b) HF is more stable than HCl.
c) HC1 is more stable than HF
d) HF and HCl are exothermic compounds​

Answer 1

Answer :

As enthalpy of formation of HF(161 kJ) is more than the enthalpy of formation of HCl(-92 kJ). So, HF is more stable than HCl and as energy is released in formation of HF and HCl, these both are exothermic compounds.

Hence, Option 'C' is the answer.