19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is
Which of the following metals does not show variable oxidation states ?
reacts with H+ as The change in oxidation number of Cr is
KMnO4 in an acidic medium oxidizes (a) C O to CO2 (b) N2H4 to N2 (c) HSO to SO
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 will not oxidize (a) (b)
is prepared by treating a solution containing Mn2+ ions with a very strong oxidizing agent such as
KMnO4 is manufactured on a large scale by (a)fusing MnO2 with KOH and then oxidizing the fused mixture with KNO3
Which of the following compounds is green in colour ?
Which of the following oxides of chromium is amphoteric in nature ?
The transition metals sometimes form nonstoichiometric compounds. These compounds have (a) definite structures and definite proportions
Which of the following ions is diamagnetic ?
Which of the following ions is paramagnetic ?
The highest possible oxidation state shown by osmium in its compounds is
Which of the following statements is correct ?
Which of the following processes does not involve oxidation of iron? (NEET 2015)
Which of the following statements about the interstitial compounds is incorrect? (NEET 2013)
Sc (Z = 21) is a transition element but Zn (Z = 30) is not because (NEET 2013)
Which of the following statements is incorrect for CrO3 ? (a)It is a bright orange solid.
The catalytic activity of transition metals and their compounds is ascribed mainly to (Mains 2012)
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 ?
The transition elements are
Which of the following ions is expected to the coloured in solution ?