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Question

If internuclear distance between Cl atoms in Cl2 is 10A & between H atoms in H2 is 2 A, then the internuclear distance between H & Cl (Electronegativity of H=2.1 & Cl=3.0) is:

A
5.919 A
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B
4.911 A
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C
5.871 A
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D
None of these
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Solution

The correct option is B 5.919 A
The radius of chlorine is one half the distance between two Cl atoms.
rCl=10A02=5A0
The radius of hydrogen is one half the distance between two H atoms.
rH=2A02=1A0
The internuclear distance between H and Cl is
rHCl=rH+rCl0.09(χClχH)=1+50.09(3.02.1)=5.919A0
Thus, the internuclear distance between H and Cl is 5.919A0

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