Question

Which of the following pairs of ions are iso-electronic and iso-structural?

• A. \( \text{CO}_3^{2-} \) and \( \text{NO}_3^{-} \)
• B. \( \text{SO}_3^{2-} \) and \( \text{NO}_3^{-} \)
• C. \( \text{ClO}_3^{-} \) and \( \text{CO}_3^{2-} \)
• D. \( \text{SO}_3^{2-} \) and \( \text{CO}_3^{2-} \)

Hint:

When looking for iso-electronic and iso-structural ions, check for the same number of electrons and similar bond angles/geometry.

Answer 1

The Correct Option is C

Iso-electronic ions are ions that have the same number of electrons, and iso-structural ions have the same structure. - \( \text{CO}_3^{2-} \) and \( \text{NO}_3^{-} \) are not iso-structural, as their bond angles and geometries are different. - \( \text{SO}_3^{2-} \) and \( \text{NO}_3^{-} \) are also not iso-structural. - \( \text{ClO}_3^{-} \) and \( \text{CO}_3^{2-} \) are iso-electronic and iso-structural. Both have 24 electrons and adopt trigonal planar geometry. Therefore, the correct answer is option (C).