JEE Main 2026 · 8 Apr · Shift 2, Chemistry question 71

Paramagnetic (unpaired electrons):

• $\ce{[MnBr4]^2-}$ ($d^5$).
• $\ce{[NiCl4]^2-}$ (tetrahedral $d^8$).
• $\ce{[CoF6]^3-}$ (high-spin $d^6$).
• $\ce{[Mn(CN)6]^3-}$ (low-spin $d^4$, 2 unpaired).
• $\ce{[Ti(CN)6]^3-}$ ($d^1$).
• $\ce{[Cu(H2O)6]^2+}$ ($d^9$).

Diamagnetic: $\ce{[Ni(CN)4]^2-}$, $\ce{[Ni(CO)4]}$, $\ce{[Fe(CN)6]^4-}$ and $\ce{[Co(C2O4)3]^3-}$ (low-spin $d^6$).

Count: 6.

Answer: 6