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Question

The bond angle which would result in the maximum dipole moment for the tri-atomic molecule XY2 (shown above) is:

16808_04f3dfab8df74d868aaff9ebe6578281.png

A
90o
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B
120o
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C
150o
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D
180o
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Solution

The correct option is B 90o
Dipole moment, μ=μ21+μ22+2μ1μ2cosθ.
Among the options given, a dipole will be maximum if θ=90o. Because cos(90+θ)<0, cos is negative in II and III quarters. However, cosθ>0 above 180o in the IVth quarter.

Hence from the given angles, the bond angle is highest for θ=90o
Option A is correct.

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