The most preferred structure among the following with the lowest energy for SO₃ is: 

1.		2.
3.		4.

The Lewis dot symbols for atoms of the elements Mg, Na, O, and N, respectively, would be:

1.
2.
3.
4.

Lewis symbols for the atoms and ions: S and S^2–; Al and Al³⁺; H and H^– respectively, would be:

1.
2.
3.
4.

Which of the following factors are favourable for the formation of an ionic bond?

Which of the following is true for the bond length?

${\mathrm{}}_{}{\mathrm{}}_{}$\(\text{H}_3\text{PO}_3\) can be represented by structures 1 and 2 shown below.

However, these two structures cannot be considered as canonical forms of a resonance hybrid because:

The application of dipole moment is/are :

How does the measurement of bond angles in methane (\(\text{CH}_4\)) rule out a square planar structure?

The lone pairs of electrons can be defined as:

The set of oxides of nitrogen that are paramagnetic in nature is:

1. NO, N₂O

2. N₂O₃, NO

3. NO, NO₂

4. N₂O, NO₂