19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Philosopher’s wool when heated with BaO at 1100ºC gives the compound :
Spiegeleisen is an alloy of :
Sodium thiosulphate, Na2S2O3. 5H2O is used in photography to :
Assertion : The melting point of Mn is more than that of Fe. Reason : Mn has higher number of unpaired e– than Fe in atomic state.
Assertion : Hg is the only metal that is liquid at 0ºC. Reason : It has a very high I.P. and weak metallic bond.
The manganate and permanganate ions are tetrahedral, due to: (NEET 2019)
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
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