Enthalpy of formation of HF and HCl are -161 kJ and -92 kJ, respectivelv. Select the incorrect statement on the basis of the above fact.

Question

Enthalpy of formation of HF and HCl are -161 kJ and -92 kJ, respectivelv. Select the incorrect statement on the basis of the above fact. (A) HF is more stable than HCl (B) HCl is more stable than HF (C) Affinity of fluorine to hydrogen is greater than affinity of chlorine to hydrogen (D) HF and HCl are exothermic compound

Tardigrade Admin · Accepted Answer

HF is more stable than HCl because more energy is produced in the formation of HF. It means HF has less energy than HCl and hence is more stable. So, we need more energy to break H - F bond. Hence, HF is more stable.

Q. Enthalpy of formation of $H F$ and $H Cl$ are $- 161 k J$ and $- 92 k J$ , respectivelv. Select the incorrect statement on the basis of the above fact.

$H F$ is more stable than $H Cl$

$H Cl$ is more stable than $H F$

Affinity of fluorine to hydrogen is greater than affinity of chlorine to hydrogen

$H F$ and $H Cl$ are exothermic compound

$H F$ is more stable than $H Cl$ because more energy is produced in the formation of $H F$ .
It means HF has less energy than $H Cl$ and hence is more stable.
So, we need more energy to break $H - F$ bond. Hence, $H F$ is more stable.

Q. Enthalpy of formation of HF and HCl are −161kJ and −92kJ, respectivelv. Select the incorrect statement on the basis of the above fact.

HF is more stable than HCl

HCl is more stable than HF