The lone pairs of electrons can be defined as:

The correct Lewis structure of acetic acid is:

1.		2.
3.		4.	None of the above.

An electron-deficient compound among the following is:

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 among the following does not contain a set of isoelectronic species?

1. $\mathrm{S}{{\mathrm{O}}_3}^{2-\mathrm{}}$, CO₃^2-, NO₃^-

2. ${\mathrm{CN}}^{-}, {\mathrm{N}}_2, \mathrm{CO}$

3. ${\mathrm{BO}}_3^{3-} , {\mathrm{CO}}_3^{2- },\mathrm{N}{{\mathrm{O}}_3}^{-}$

4. ${\mathrm{PO}}_4^{3-}, {\mathrm{SO}}_4^{2-}, \mathrm{Cl}{{\mathrm{O}}_4}^{-}$

Which of the following statements is incorrect?

1. For isoelectronic species, a smaller positive charge on the cation results in a smaller ionic radius.
2. For isoelectronic species, a greater negative charge on the anion results in a larger ionic radius.
3. Atomic radius increases as you move down Group 1 of the Periodic Table.
4. Atomic radius decreases across Period 2 from left to right.

Which of the following pairs of ions are isoelectronic and isostructural?

1. ${\mathrm{CO}}_3^{2-}, {\mathrm{SO}}_3^{2-}$

2. ${\mathrm{ClO}}_3^{-}, {\mathrm{CO}}_3^{2-}$

3. ${\mathrm{SO}}_3^{2-}, {\mathrm{NO}}_3^{-}$

4. ${\mathrm{ClO}}_3^{-}, {\mathrm{SO}}_3^{2-}$

The significance of the octet rule is:

1. To determine the stability of atoms.
2. To find the hybridization of elements.
3. To calculate the number of lone pairs.
4. None of the above.

Which pair of ions from the following list do not constitute an iso-electronic pair?

1. Mn²⁺, Fe³⁺

2. Fe²⁺, Mn²⁺

3. O^2–, F^–

4. Na⁺, Mg²⁺