Number of paramagnetic complexes among the following is \ \ \ \ . [ MnBr 4 ] 2- , [ NiCl 4 ] 2- , [ Ni ( CN ) 4 ] 2- , [ Ni ( CO ) 4 ] , [ CoF 6 ] 3- , [ Fe ( CN )] 4- [ Mn ( CN ) 6 ] 3- , [ Ti ( CN ) 6 ] 3- , [ Cu ( H 2 O ) 6 ] 2+ , [ Co ( C 2 O 4 ) 3 ] 3-

Chemistry · Coordination Compounds

JEE Main 2026 — 8 April, Evening Shift — Question 59

Number of paramagnetic complexes among the following is $\_\_\_\_$ . $\left[\mathrm{MnBr}_{4}\right]^{2-}$ , $\left[\mathrm{NiCl}_{4}\right]^{2-}$ , $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ , $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ , $\left[\mathrm{CoF}_{6}\right]^{3-}$ , $[\mathrm{Fe}(\mathrm{CN})]^{4-}$ $\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}, \quad\left[\mathrm{Ti}(\mathrm{CN})_{6}\right]^{3-}$ , $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$

Answer: 6

Numerical answer — enter this value.

Step-by-step solution

$\left[\mathrm{MnBr}_{4}\right]^{2-}$ , $\left[\mathrm{NiCl}_{4}\right]^{2-}$ , $\left[\mathrm{CoF}_{6}\right]^{3-}$ , $\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$ , $\left[\mathrm{Ti}(\mathrm{CN})_{6}\right]^{3-}$ , $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ are paramagnetic.

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Exam: JEE Main 2026
Paper: 8 April, Evening Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Theories of Bonding in Coordination Compounds