Solve the following

Question:

The freezing point of a $1.00 \mathrm{~m}$ aqueous solution of $\mathrm{HF}$ is found to be $-1.91^{\circ} \mathrm{C}$. The freezing point constant of water, $\mathrm{K}_{\mathrm{f}}$, is $1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$. The percentage dissociation of HF at this concentration is

 

  1. $2.7 \%$

  2. $30 \%$

  3. $10 \%$

  4. $5.2 \%$


Correct Option: 1

Solution:

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