19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is
Acidified K2Cr2O7 on treatment with KI produces
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
The incorrect statement among the following is: (NEET 2021)
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of: (NEET 2021)
Which of the following statements is correct ?
Identify the incorrect statement. (NEET 2020)
The highest possible oxidation state shown by osmium in its compounds is
Identify the incorrect statement. (NEET 2020)
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
The calculated spin only magnetic moment o 2+ Cr ion is : (NEET 2020)
When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is (Odisha NEET 2019)
Which of the following is not true about the transition elements ?