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In PH2F3, how many bond angles are smaller than 120 deg?

1. 1
2. 2
3. 3
4. 4

Correct answer: 4

Solution

In trigonal bipyramidal PH2F3 the two F occupy axial sites and the angles between each axial F and the equatorial atoms are 90 deg; there are four such axial-equatorial angles less than 120 deg.

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