Question

Which of the following contains the maximum number of lone pairs on the central atom?

• A. ClO⁻₃
• B. XeF₄
• C. SF₄
• D. I⁻₃

Hint:

To find the number of lone pairs on the central atom, calculate the total valence electrons, subtract bonding electrons, and divide the remainder by 2.

Answer 1

The Correct Option is D

• ClO⁻₃: Central Cl atom has 1 lone pair.
• XeF₄: Central Xe atom has 2 lone pairs.
• SF₄: Central S atom has 1 lone pair.
• I⁻₃: Central I atom has 3 lone pairs.

Thus, I⁻₃ has the maximum number of lone pairs (3) on its central atom.

Answer 2

Correct Answer:

Option 4: I₃^-

Explanation:

• ClO₃^-: 1 lone pair on Cl.
• XeF₄: 2 lone pairs on Xe.
• SF₄: 1 lone pair on S.
• I₃^-: 3 lone pairs on the central I.

I₃^- has the maximum number of lone pairs (3) on the central iodine atom.