Q6 / 180 · COMEDK 2013 · Chemistry

Enthalpy of formation of $\mathrm{HF}$ and $\mathrm{HCl}$ are $-161 \mathrm{~kJ}$ and $-92 \mathrm{~kJ}$ respectively. Which of the following statements is incorrect?

  • Correct answer
    A
    $\mathrm{HCl}$ is more stable than $\mathrm{HF}$.
  • B
    $\mathrm{HF}$ and $\mathrm{HCl}$ are exothermic compounds.
  • C
    The affinity of fluorine to hydrogen is greater than the affinity of chlorine to hydrogen.
  • D
    $\mathrm{HF}$ is more stable than $\mathrm{HCl}$.

Solution

As enthalpy of formation of $\mathrm{HF}$ is more negative, than that of $\mathrm{HCl}$ and $\mathrm{HF}$ is more stable than HCl. The bond strength of hydrogen with halogen decrease down the group due to increases in size.

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

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