Consider the following statements and determine which are true and which are fal

Question

Consider the following statements and determine which are true and which are false.

SeF4 is a polar molecule.
NO3- has only two resonance Lewis structures.
Bond angles for IF6+ are 60 °.
The formal oxidation state of an atom in a molecule (or molecular ion) can be calculated as:
(the number of valence electrons on a free atom) minus (half the number of electrons in bonds to that atom) minus (the number of unshared electrons assigned to the atom in the molecule)
SeF4 has a square planar structure.
Silane (SiH4) is a non-polar molecule.

Explanation / Answer

i.SeF4 is a polar molecule   = TRUE (due to having see-saw shape)
ii. NO3- has only two resonance Lewis structures = FALSE (it has three resonance structures)
iii. Bond angles for IF6+ are 60 ° = TRUE
iv. The formal oxidation state of an atom in a molecule (or molecular ion) can be calculated as:
(the number of valence electrons on a free atom) minus (half the number of electrons in bonds to that atom) minus (the number of unshared electrons assigned to the atom in the molecule) = TRUE
v. SeF4 has a square planar structure = FALSE (see-saw shape)
vi. Silane (SiH4) is a non-polar molecule = TRUE

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