19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Transition metals
The value of magnetic moment ( spin only) for Cu2+ in CuSO4.5H2O is
The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are (NEET-I 2016)
Which one of the following oxides of chromium is amphoteric in nature ?
Name the gas that can readily decolourise acidified KMnO4 solution. (NEET 2017)
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code (NEET 2018) Column I Column II A. Co3+ i. 8 B.M. B. Cr…
Which one of the following ions exhibits d-d transition and paramagnetic as well? (NEET 2018)
When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is (Odisha NEET 2019)
The calculated spin only magnetic moment o 2+ Cr ion is : (NEET 2020)
Identify the incorrect statement. (NEET 2020)
Identify the incorrect statement. (NEET 2020)
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of: (NEET 2021)
The incorrect statement among the following is: (NEET 2021)
The compound ZnSO4 is white because (a)charge is transferred from the metal to the oxygen atoms (b)electron transfer to d level does not occur as the level is already filled to capacity in zinc
Which of the following compounds is colourless?
Which of the following compounds is expected to be coloured ?
Identify the species having an atom in +6 oxidation state. (a) (b) [Cr(CN) ] (c)
Heat 4K Cr O 4K CrO 3O X -> . In the above reaction X is
Chromyl chloride, CrO2Cl2, is prepared by heating a mixture of
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
reacts with OH– as CrO 2CrO 2H Cr O H O -> Cr O The change in oxidation number of Cr is
CrO3 dissolves in aqueous NaOH to give (a) CrO
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
The covalent radii of transition metals decrease from left to right in a period because
Acidified K2Cr2O7 on treatment with KI produces