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The dipole moment of LiH is 1.964 xx10^(...

The dipole moment of `LiH` is `1.964 xx10^(-29)C-m` and the interatomic diatance between `Li` and `H` in this molceule is `1.596Å` .What is the per cent ionic character in `LiH`.

A

`75.0`

B

`76.8`

C

`79.8`

D

100

Text Solution

Verified by Experts

The correct Answer is:
B
The dipole moment of 100% ionic molecule = (1 electronic charge) `xx` (interatomic distance)
` = 1.602 xx 10^(-19) xx 1.596 xx 10^(-10) = 2.557 xx 10^(-29) ` cm
Fractional ionic character = ` "Exp. Value of dipole moment "/"Theoretical value of dipole moment " = (1.964 xx 10^(-29))/(2.557 xx 10^(-29)) = 0.768`
The bond in LiH is ` 76.8%` ionic.
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