19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following processes does not involve oxidation of iron? (NEET 2015)
The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are (NEET-I 2016)
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)
The manganate and permanganate ions are tetrahedral, due to: (NEET 2019)
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)
Which of the following elements has completely filled d orbitals (the d10 configuration) ?
The electronic configurations of the first four members of the actinide series cannot be written accurately in a regular manner because of
The last electron of a d-block element occupies the orbital
Transition metals
Among the transition metals, the melting points of Zn, Cd and Hg are relatively low because
The noble character of platinum and gold is favoured by
Which of the following statements is correct ?
The highest possible oxidation state shown by osmium in its compounds is
Which of the following ions is paramagnetic ?
Which of the following ions is diamagnetic ?
Which of the following metals does not show variable oxidation states ?
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