19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
What is the coordination number of cobalt in [Co(NH3)6]Cl3?
In the complex ion [Fe(H2O)5NO]2+
The pair in which both species have same magnetic moment (spin only value) is [AIIMS 2006]
[Fe(CN)6]3– ion is
The oxidation number of Fe in K3[Fe(CN)5NO] is (assume NO as a neutral)
The number of possible isomers of an octahedral complex [Co(C2O4)2 (NH3)2]– is [AIIMS2006]
Among the following, the species having square planar geometry for central atom are [AIIMS2006] (i) XeF4 (ii) SF4 (iii) [NiCl4] 2– (iv) [PtCl4] 2–
In which of the following coordination entities the magnitude of o (CFSE in octahedral field) will be maximum? (At. no. Co = 27) [CBSE AIPMT2007]
The oxidation number of Co in [Co(en)3]2(SO4)3 is
Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2) [CBSE AIPMT 2007]
The IUPAC name for the complex compound Li[AlH4] is
The d-electron configuration of Cr 2+, Mn 2+, Fe 2+ and Co 2+ are d 4, d 5, d 6 and d 7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? [CBSE AIPMT 2007]
The hybridization states of the central atom in the complex ions [FeF6]3–, [Fe(H2O)6]3+ and [Ni(NH3)6]2+ are
Which of the following complex ions, which is diamagnetic in nature? [CBSE AIPMT 2008]
Which of the following complexes exhibit the highest paramagnetic behaviour? (where, gly = glycine, en = ethylenediammine and bpy = bipyridyl moities) (At. no : Ti = 22, V = 23, Fe = 26, Co = 27) [CBSE AIPMT 2008]
The formation of the complex ion [Co(NH3)6]3+ involves sp3d2 hybridization of Co3+. Hence, the complex ion should possess
How many electrons are present in 3d orbital of tetrahedral K2[NiCl4] complex? [Guj. CET 2008]
The oxidation number of Cr in [Cr(C6H6)2] is
Which of the following complex ion is expected to absorb visible light? [CBSE AIPMT 2009]
What is the oxidation number of Fe in Fe(CO)5?
Which of the following coordination entities should be expected to absorb light of lowest frequency?[AIIMS2009]
Assertion: CO and CN are referred as acid ligands. Reasaon: In CO and CN vacant type orbitals are present. [AIIMS 2009]
Assertion: K4[Fe(CN)6] is diamagnetic and [Fe(H2O)6]Cl3 is paramagnetic. Reason: Hybridisation of central metal in K4[Fe(CN)6] is sp3d2, while in [Fe(H2O)6]Cl3 is d 2sp 3. [AIIMS 2009]
The charge on the central metal ion in the complex [Ni(CO)4] is
The oxidation states of Cr in [Cr(H2O)6]Cl3, [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2)(NH3)] respectively are: