Q72 / 180 · AIIMS 2001 · Chemistry

Which one forms $\mathrm{KHX}_2$ type compound?

  • Correct answer
    A
    $\mathrm{HF}$
  • B
    $\mathrm{HCl}$
  • C
    $\mathrm{HI}$
  • D
    $\mathrm{HBr}$

Solution

Hydrogen fluoride is an associated molecule and can be represented by $\mathrm{H}_2 \mathrm{~F}_2$. This is due to the fact that strong hydrogen bonding exists between the molecules. (as $\mathrm{F}$ is highly electronegative element) $$ \mathrm{H}_2 \mathrm{~F}_2+\mathrm{KF} \rightarrow \mathrm{KHF}_2+\mathrm{HF} $$

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

Relevant Questions