19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The transition metals sometimes form nonstoichiometric compounds. These compounds have (a) definite structures and definite proportions
Which of the following oxides of chromium is amphoteric in nature ?
Which of the following compounds is green in colour ?
KMnO4 is manufactured on a large scale by (a)fusing MnO2 with KOH and then oxidizing the fused mixture with KNO3
is prepared by treating a solution containing Mn2+ ions with a very strong oxidizing agent such as
KMnO4 in an acidic medium will not oxidize (a) (b)
Which of the following is an incorrect statement ? (a)In a redox reaction in acidic medium, KMnO4 produces Mn2+ ions. (b)In a redox reaction in strongly alkaline medium, KMnO4produces MnO ions. (c)In a redox reaction …
KMnO4 in an acidic medium oxidizes (a) C O to CO2 (b) N2H4 to N2 (c) HSO to SO
reacts with H+ as The change in oxidation number of Cr is
Which of the following complex ions is paramagnetic?
The structures of Ni(CO)4 and Ni(PPh3)2Cl2 are
Which of the following statements is correct?
The formation of the complex ion [Co(NH3)6]3+ involves sp3d2 hybridization of Co3+. Hence, the complex ion should possess
The hybridization states of the central atom in the complex ions [FeF6]3–, [Fe(H2O)6]3+ and [Ni(NH3)6]2+ are
The hybridization states of the central atom in the complexes Fe(CN)6 3–, Fe(CN)6 4– and CO(NO2)6 3– are
Which one of the following has a square planar geometry? (At. no. Co = 27, Ni = 28, Fe = 26, Pt = 78)
The magnetic moment of a complex ion is 2.83 BM. The complex ion is
The value of magnetic moment for a complex ion is 1.73 BM. The complex. ion is
Among the following ions, which one has the highest paramagnetism?
An octahedral complex is formed when hybrid orbitals or the following type are involved
The effective atomic number for the complex ion [Ni(CN)4]2– is
Consider the following complex ions, P, Q and R. P = [FeF6]3- , Q = [V(H2O)6]2+ and R = [Fe(H2O)6]2+ The correct order of the complex ions, according to their spin-only magnetic moment values (in BM) is
Among [NiCO)4], [NiCl4]2–, [Co(NH3)4Cl2] Cl, Na3 [CoF6], Na2O2 and CsO2, the total number of paramagnetic compounds is
In Fe(CO)5, the Fe – C bond possesses
Among [NiCO)4], [NiCl4]2–, [Co(NH3)4Cl2] Cl, Na3 [CoF6], Na2O2 and CsO2, the total number of paramagnetic compounds is