Question

Which of the following does not represent the correct order of the property indicated?

• A. \( \text{Sc}^{3+}<\text{Cr}^{3+}<\text{Fe}^{3+}<\text{Mn}^{3+} \) — ionic radii
• B. \( \text{Sc}^{3+}<\text{Ti}^{4+}<\text{Cr}^{3+}<\text{Mn}^{3+} \) — density
• C. \( \text{Mn}^{2+}>\text{Ni}^{2+}>\text{Co}^{2+}<\text{Fe}^{2+} \) — ionic radii
• D. \( \text{Fe}^{2+}<\text{Ca}^{2+}<\text{Mn}^{2+}<\text{Cu}^{2+} \) — basic nature

Hint:

When comparing ionic radii, consider the charge and the number of electrons in the ion.

Answer 1

The Correct Option is A

The order of ionic radii is incorrect because \( \text{Mn}^{3+} \) has a smaller ionic radius than \( \text{Fe}^{3+} \), making the sequence incorrect.