Multiple choice

Why does BeF2 have zero dipole moment whereas H2O has a positive dipole moment?

  1. Because H2O is a linear molecule

  2. Because O is more electronegative than F

  3. Because H2O is a bent shape molecule

  4. Because hydrogen bonding is present in H­2O
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The BeF2 molecule is linear and non-polar. Bonds are polar, but equivalent force acting on Be with 180o angle is zero. So, the molecule is non-polar. The molecular geometry of H2O is bent with asymmetric charge distribution about the central oxygen atom. Therefore, this molecule is polar.  

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