1.

Which bond angle 0 would result in the maximum dipole moment for the triatomic molecule XY_(2) as shown in figure?

Answer»

`90^(@)`
`120^(@)`
`150^(@)`
`180^(@)`

SOLUTION :The dipole moment of two dipoles inclined at an angle `theta` is GIVEN by the equation.
`mu=sqrt(X^(2)+Y^(2)+2XYcos theta)`
`cos90^(@)=0`. As the angle increases from `90^(@)-180^(@)` the valueof `cos theta` becomes more and more -ve and HENCE resultant decreases. Thus, dipole moment is maximum when `theta=90^(@)`


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