Q18 / 170 · Manipal (MET) 2016 · Chemistry

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

  • A
    HF is more stable than HCl
  • Correct answer
    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

Solution

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.

Hence, the correct answer is option: 'B'.

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