19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one of the following ions is the most stable in aqueous solution ? (At. no. Ti = 22, V = 23, Cr = 24, Mn = 25) (CBSE AIPMT 2007)
Which of the following statements is incorrect for CrO3 ? (a)It is a bright orange solid.
Deep red-yellow vapour of CrO2Cl2 is passed into an aqueous solution of NaOH. The solution turns
Which of the following oxides of manganese is amphoteric ?
Which of the following oxides of manganese is stable as well as strongly acidic ?
HgCl reacts with mercury in an iron vessel to form mercurous chloride. HgCl + Hg Hg Cl Δ -> 2. Mercurous chloride can also be prepared by the reduction of mercury chloride by tin. 2+ 2HgCl + SnCl Hg Cl SnCl ->
Chemically philosopher of wool is :
When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is
Which of the following elements has completely filled d orbitals (the d10 configuration) ?
The covalent radii of transition metals decrease from left to right in a period because
For a given ion, the magnetic moment is 2.83 BM. The total spin (s) of all the unpaired electrons is
Which of the following is not true about the transition elements ?
Which of the following ions has the maximum number of unpaired d electrons ?
Which of the following does not possess unpaired electrons ?
Which of the following electronic configurations represents Fe3+ ?
Which of the following ions is expected to the coloured in solution ?
The transition elements are
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