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 statements is correct?
Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2) [CBSE AIPMT 2007]
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]
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]
How many electrons are present in 3d orbital of tetrahedral K2[NiCl4] complex? [Guj. CET 2008]
Which of the following complex ion is expected to absorb visible light? [CBSE AIPMT 2009]
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]
Again for [Fe(H2O)6]Cl3, since H2O is a weak field ligand, the unpaired electrons will not get paired up. Thus the hybridization of Fe will besp 3d 2. So, the reason is not correct. Hence, the correct option is (c).
The coordination compound of which one of the following compositions will produce two equivalents of AgCl on reaction with aqueous silver nitrate solution? [J&K CET 2009]
The existence of two different coloured complexes with the composition [Co(NH3)4Cl2] + is due to [CBSE AIPMT2010]
Crystal field stabilisation energy for high spin d octahedral complex is [CBSE AIPMT2010]
Which of the following complex ion is not expected to absorb visible light? [CBSE AIPMT 2010]
Assertion: If 4 for [Cu(NH3)4] 2+ is 2.1 × 10 13, its instability constant is 4.76 × 10 –14. Reason: Overall dissociation equilibrium constant varies inversely with formation constant. [AIIMS2010]