Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main20245 Apr 2024Morning ShiftChemistryCoordination CompoundsActual

Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, ( Cr =24, Mn =25, Fe =26, Co =27 ) ]

Options

  1. A( [ Cr ( H ₂ O )₆ ]²⁺ )
  2. B( [ Fe ( H ₂ O )₆ ]²⁺ )
  3. C( [ Co ( H ₂ O )₆ ]²⁺ )
  4. D( [ Mn ( H ₂ O )₆ ]²⁺ )

Correct answer

C. ( [ Co ( H ₂ O )₆ ]²⁺ )

Step-by-step solution

array |l|l|l| & array l Number of unpaired e array & = n ( n +2) B.M. [ Co ( H ₂ O )₆ ]²⁺ & 3 & 3.87 [ Fe ( H ₂ O )₆ ]²⁺ & 4 & 4.89 [ Mn ( H ₂ O )₆ ]²⁺ & 5 & 5.92 [ Cr ( H ₂ O )₆ ]²⁺ & 4 & 4.89 array Least paramagnetic behaviour = [ Co ( H ₂ O )₆ ]²⁺

Practice Coordination Compounds on Quantrex Academy →

More from Coordination Compounds

Reaction of PtF ₆ with oxygen ( O ₂ ) gas results in the formation of an ionic compound, X ^+ Y ^- . Correct statement(s) is(are) 2026The total number of all possible isomers for the square planar complex with formula K [ M(NCS)(NO ₂ )(gly) ] is ____. ( M = metal ion and gly = NH ₂ CH ₂ COO ^- ) 2026Consider that the coordinating atoms of the ligands in cis -[Co(NH₃ )₄ Cl₂ ]Cl and mer -[Co(NH₃ )₃ Cl₃ ] octahedral complexes are at the vertices of an octahedron. The sum of total 2026Number 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) ₆]⁴⁻ , [ Mn(CN) ₆]³⁻ , [ Ti(CN) ₆] 2026Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A. [ NiCl ₄]²⁻- sp ^3 , tetrahedral, paramagnetic 2026An excess of AgNO₃ is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles of AgCl precipitated will be __________ 10⁻³ . (Neares 2026Match the List-I with List-II List-I Electronic configuration of tetrahedral metal ion List-II Crystal Field Stabilization Energy ( _t ) A. d^2 I. -0.6 B. d^4 II. -0.8 C. d^6 III. 2026Which of the following are true about the energy of the given d-orbitals of a tetrahedral complex? A. d_ xy = d_ xz > d_ x^2-y^2 B. d_ xy = d_ yz > d_ z^2 C. d_ x^2-y^2 > d_ z^2 > 2026 Full Coordination Compounds list All JEE Main PYQs