Bond distance in $\mathrm{HF}$ is $9.17 \times 10^{-11} \mathrm{~m}$. Dipole moment of $\mathrm{HF}$ is $6…

Bond distance in $\mathrm{HF}$ is $9.17 \times 10^{-11} \mathrm{~m}$. Dipole moment of $\mathrm{HF}$ is $6.104 \times 10^{-30} \mathrm{Cm}$. The percentage ionic character in $\mathrm{HF}$ will be : (electron charge $=1.60 \times 10^{-19} \mathrm{C}$ )
  1. $61.0 \%$
  2. $38.0 \%$
  3. $35.5 \%$
  4. $41.5 \%$

Solution

Given $e=1.60 \times 10^{-19} \mathrm{C}$ $ d=9.17 \times 10^{-11} \mathrm{~m} $ From $\mu=e \times d$ $ \begin{aligned} \mu & =1.60 \times 10^{-19} \times 9.17 \times 10^{-11} \\ & =14.672 \times 10^{-30} \end{aligned} $ $\%$ ionic character $=\frac{\text { Observed dipole moment }}{\text { Dipole moment for } 100 \%}$ $ \begin{aligned} & =\frac{6.104 \times 10^{-30}}{14.672 \times 10^{-30}} \times 100 \\ & =41.5 \% \end{aligned} $

Asked in: JEE Main 2013 (23 Apr Online)

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