19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
reacts with H+ as The change in oxidation number of Cr is
When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is
Acidified K2Cr2O7 on treatment with KI produces
Na2CrO4 on treatment with lead acetate gives a precipitate. This precipitate is dried and the solid is used as a pigment for road signs and markings. The solid is known as
CrO3 dissolves in aqueous NaOH to give (a) CrO
reacts with OH– as CrO 2CrO 2H Cr O H O -> Cr O The change in oxidation number of Cr is
Sodium chromate is prepared by (a)fusing chromite (FeCr2O4) with sodium chloride in air (b)fusing chromite (FeCr2O4) with sodium hydroxide in air (c)fusing (NH4)2Cr2O7 with sodium hydrogen sulphate in nitrogen
Chromyl chloride, CrO2Cl2, is prepared by heating a mixture of
Heat 4K Cr O 4K CrO 3O X -> . In the above reaction X is
Identify the species having an atom in +6 oxidation state. (a) (b) [Cr(CN) ] (c)
Chromyl chloride, CrO2Cl2, is prepared by heating a mixture of