JEE Advanced 2016 · Paper 1 · Chemistry Q22

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ChemistrySingle correct+3 / -1Question 22 of 54

Among $\ce{[Ni(CO)4]}$ , $\ce{[NiCl4]^{2-}}$ , $\ce{[Co(NH3)4Cl2]Cl}$ , $\ce{Na3[CoF6]}$ , $\ce{Na2O2}$ and $\ce{CsO2}$ , the total number of paramagnetic compounds is

Answer and worked solution

Official answer: B

Species	Electrons	Magnetic?
$\ce{[Ni(CO)4]}$	Ni(0), $3d^{10}$	diamagnetic
$\ce{[NiCl4]^{2-}}$	Ni²⁺ $d^8$ , tetrahedral, 2 unpaired	paramagnetic
$\ce{[Co(NH3)4Cl2]Cl}$	Co³⁺ $d^6$ , low spin	diamagnetic
$\ce{Na3[CoF6]}$	Co³⁺ $d^6$ , high spin (weak F⁻), 4 unpaired	paramagnetic
$\ce{Na2O2}$	peroxide $\ce{O2^{2-}}$	diamagnetic
$\ce{CsO2}$	superoxide $\ce{O2^-}$ , 1 unpaired	paramagnetic

Total: 3 paramagnetic compounds.

(B)

Topics:Magnetic properties and colour Crystal field theory

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JEE Advanced 2016 · Paper 1, Chemistry question 22