MCQ
The interatomic distances in ${H_2}$ and $C{l_2}$ molecules are $74$ and $198$ $pm$ respectively. The bond length of $HCl$ is ............. $\mathrm{pm}$
- A$272$
- ✓$136$
- C$124$
- D$248$
✓
Answer
Correct option: B.
$136$
(b) Middle length of ${H_2} = 74\,pm$
Length of $H = \frac{{74}}{2} = 37pm$
Middle length of $C{l_2} = 198\,pm $
Length of $Cl$$ = \frac{{198}}{2} = 99\,pm$
Bond length of $HCl$ = Length of $H +$ Length of $Cl = 37 + 99 = 136 \,pm$
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