KCET2020Chemistryd and f Block Elements
Identify the set of paramagnetic ions among the following.
Options
- AV ²⁺, Co ²⁺, Ti ⁴⁺
- BNi ²⁺, Cu ²⁺, Zn ²⁺
- CTi ²⁺, Cu ²⁺, Mn ³⁺
- DSc ³⁺, Ti ³⁺, V ³⁺
Correct answer
C. Ti ²⁺, Cu ²⁺, Mn ³⁺
Step-by-step solution
Out of the given four options, the following set of ions is paramagnetic : Ti ²⁺, Cu ²⁺, Mn ³⁺ Ti 4 s², 3 d² (ground state) Ti ²⁺ 3 d² 2 unpaired electrons. Cu 4 s¹, 3 d¹⁰ (ground state) Cu ²⁺ 3 d⁹ 1 unpaired electrons. Mn 4 s², 3 d⁵ (ground state) Mn ³⁺ 3 d⁴ 4 unpaired electrons. A substance is called paramagnetic if it contains at least one unpaired electron.