To evaluate the statements, we need to analyze each one carefully.
- SeF4 is a polar molecule: True
Since SeF4 has a bent structure due to the presence of a lone pair on the selenium atom, the dipole moments from the Se-F bonds do not cancel out, resulting in a polar molecule. - NO3 has only two resonance Lewis structures: False
The nitrate ion (NO3-) actually has three resonance structures. These structures involve the movement of the double bond between the nitrogen and one of the oxygen atoms while keeping the overall charge and arrangement intact. - Bond angles for IF6+ are 60 degrees: False
IF6+ has an octahedral geometry where the bond angles are 90 degrees due to its six bonded pairs of electrons around the iodine atom. The 60-degree angle is characteristic of different molecular geometries.
In summary, only the first statement about SeF4 being a polar molecule is true. The nitrate ion has three resonance structures rather than two, and the bond angles in IF6+ are 90 degrees, not 60.